fix links issue when pathPrefix is used

[fblackburn1]

why: pathPrefix option is used by zuul
To test with prefix

diff --git a/docker-compose-tests.yml b/docker-compose-tests.yml
index f968be7..b4bafa2 100644
--- a/docker-compose-tests.yml
+++ b/docker-compose-tests.yml
@@ -7,7 +7,7 @@ services:
       - ./public:/app/public:ro
     expose:
       - "8000"
-    command: bash -c "cd /app/public && python -m http.server 8000"
+    command: bash -c "cd /app && python -m http.server 8000"
   # Allow to run scrap tests before deployment
   test:
     build: tests
diff --git a/gatsby-config.js b/gatsby-config.js
index 6a3c341..0456e66 100644
--- a/gatsby-config.js
+++ b/gatsby-config.js
@@ -7,6 +7,7 @@ const path = require('path');
  */
 
 module.exports = {
+  pathPrefix: '/public',
   plugins: [
     'gatsby-plugin-react-helmet',
     {

[wazo-community-zuul]

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[wazo-community-zuul]

Build succeeded.

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• yarn-prettier-uc-doc : SUCCESS in 8m 46s

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Build failed.

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• yarn-prettier-uc-doc : SUCCESS in 10m 29s

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Build succeeded.

• yarn-build-copy : SUCCESS in 17m 12s
• yarn-prettier-uc-doc : SUCCESS in 10m 46s

[wazo-community-zuul]

Build succeeded.

• yarn-build-copy : SUCCESS in 15m 19s
• yarn-prettier-uc-doc : SUCCESS in 8m 30s

[fblackburn1]

With latest commits I have the following links broken when using prefix (see first post to how to test)

wazo-platformorg-test-1  |  Error in http://server:8000/public/tutorials (from http://server:8000/public/blog): Error: statuses 404                                                                        
wazo-platformorg-test-1  | Error in http://server:8000/uc-doc/system/wazo-confd/developer (from http://server:8000/public/documentation/overview/configuration.html): Error: statuses 404                  
wazo-platformorg-test-1  | Error in http://server:8000/contribute/code (from http://server:8000/public/contribute): Error: statuses 404                                                                    
wazo-platformorg-test-1  | Error in http://server:8000/uc-doc/installation/install-system (from http://server:8000/public/contribute): Error: statuses 404
wazo-platformorg-test-1  | Error in http://server:8000/documentation (from http://server:8000/public/contribute): Error: statuses 404
wazo-platformorg-test-1  | Error in http://server:8000/uc-doc/contributors/provisioning/developing_plugins (from http://server:8000/public/contribute): Error: statuses 404
wazo-platformorg-test-1  | Error in http://server:8000/ecosystem (from http://server:8000/public/contribute): Error: statuses 404
wazo-platformorg-test-1  | Error in http://server:8000/use-cases (from http://server:8000/public/blog/release-review-2211): Error: statuses 404
wazo-platformorg-test-1  | Error in http://server:8000/uc-doc/upgrade/ (from http://server:8000/public/blog/release-review-2211): Error: statuses 404
wazo-platformorg-test-1  | Error in http://server:8000/public/blog/creating-our-webrtc-demo (from http://server:8000/public/blog): Error: statuses 404,404,404,404,404,404,404,404
wazo-platformorg-test-1  | Error in http://server:8000/public/blog/creating-cross-platform-push-to-talk-app (from http://server:8000/public/blog): Error: statuses 404,404,404,404,404,404,404,404,404,404
wazo-platformorg-test-1  | Error in http://server:8000/uc-doc/upgrade/introduction (from http://server:8000/public/blog/release-review-2004): Error: statuses 404
wazo-platformorg-test-1  | Error in http://server:8000/uc-doc/upgrade/upgrade_notes (from http://server:8000/public/blog/release-review-2003): Error: statuses 404
wazo-platformorg-test-1  | Error in http://server:8000/blog/wazo-platform-c4-overview (from http://server:8000/public/blog/install-wazo-c4-with-ansible): Error: statuses 404
wazo-platformorg-test-1  | Error in http://server:8000/use-cases/class-4 (from http://server:8000/public/blog/install-wazo-c4-with-ansible): Error: statuses 404
wazo-platformorg-test-1  | Error in http://server:8000/documentation/overview/router-confd.html (from http://server:8000/public/blog/sprint-review-2001): Error: statuses 404
wazo-platformorg-test-1  | Error in http://server:8000/public/blog/scale-asterisk-apps (from http://server:8000/public/blog): Error: statuses 404,404
wazo-platformorg-test-1  | Error in http://server:8000/public/blog/kamailio-developpers-meeting-2019-kemi (from http://server:8000/public/blog): Error: statuses 404
wazo-platformorg-test-1  | Error in http://server:8000/blog/wazo-platform-c4-on-kubernetes (from http://server:8000/public/blog/kamailio-consul-service-discovery): Error: statuses 404
wazo-platformorg-test-1  | Error in http://server:8000/public/blog/kamailio-ha-dispatcher-and-dmq (from http://server:8000/public/blog): Error: statuses 404
wazo-platformorg-test-1  | Error in https://www.queuemetrics.com/ (from http://server:8000/public/blog/wazo-queuemetrics-partnership): Error: statuses 403
wazo-platformorg-test-1  | Error in http://server:8000/blog/wazo-admin-ui (from http://server:8000/public/blog/sprint-review-1707): Error: statuses 404
wazo-platformorg-test-1  | Error in http://server:8000/blog/sprint-review-1616 (from http://server:8000/public/blog/wazo-admin-ui): Error: statuses 404
wazo-platformorg-test-1  | Error in http://server:8000/blog/sprint-review-1701 (from http://server:8000/public/blog/wazo-admin-ui): Error: statuses 404
wazo-platformorg-test-1  | Error in http://server:8000/blog/sprint-review-1706 (from http://server:8000/public/blog/wazo-admin-ui): Error: statuses 404
wazo-platformorg-test-1  | Error in http://server:8000/blog/introducing-wazo (from http://server:8000/public/blog/sprint-review-1616): Error: statuses 404
wazo-platformorg-test-1  | Error in http://server:8000/public/uc-doc/installation/install-system (from http://server:8000/public/use-cases): Error: statuses 404
wazo-platformorg-test-1  | Error in http://server:8000/public/uc-doc/ (from http://server:8000/public/use-cases): Error: statuses 404
wazo-platformorg-test-1  | Error in http://server:8000/uc-doc/contributors/provisioning/introduction-to-the-plugin-model-of-the-new-provisioning-server (from http://server:8000/public/documentation/overview/provisioning.html): Error: statuses 404
wazo-platformorg-test-1  | Error in http://server:8000/uc-doc/contributors/provisioning/httptftp-requests-processing-in-provd-part-1 (from http://server:8000/public/documentation/overview/provisioning.html): Error: statuses 404          
wazo-platformorg-test-1  | Error in http://server:8000/uc-doc/contributors/provisioning/httptftp-requests-processing-in-provd-part-2 (from http://server:8000/public/documentation/overview/provisioning.html): Error: statuses 404

[wazo-community-zuul]

Build succeeded.

• yarn-build-copy : SUCCESS in 16m 37s
• yarn-prettier-uc-doc : SUCCESS in 9m 45s

[sduthil]

recheck

[wazo-community-zuul]

Build failed.

• yarn-build-copy : NODE_FAILURE in 0s
• yarn-prettier-uc-doc : FAILURE in 24m 52s

[sduthil]

recheck

[wazo-community-zuul]

Build failed.

• yarn-build-copy : NODE_FAILURE in 0s
• yarn-prettier-uc-doc : FAILURE in 24m 26s