docs: added note to not forget to add https:// to the plausible-host (for #1337) (#2000)

* docs: added note to not forget to add https:// to the plausible-host (for #1337)

* Update docs/configuration.md

---------

Co-authored-by: Jacky Zhao <j.zhao2k19@gmail.com>

Author: c2vi

docs/configuration.md

@@ -27,7 +27,7 @@ This part of the configuration concerns anything that can affect the whole site.
 - `analytics`: what to use for analytics on your site. Values can be
   - `null`: don't use analytics;
   - `{ provider: 'google', tagId: '<your-google-tag>' }`: use Google Analytics;
-  - `{ provider: 'plausible' }` (managed) or `{ provider: 'plausible', host: '<your-plausible-host>' }` (self-hosted): use [Plausible](https://plausible.io/);
+  - `{ provider: 'plausible' }` (managed) or `{ provider: 'plausible', host: 'https://<your-plausible-host>' }` (self-hosted, make sure to include the `https://` protocol prefix): use [Plausible](https://plausible.io/);
   - `{ provider: 'umami', host: '<your-umami-host>', websiteId: '<your-umami-website-id>' }`: use [Umami](https://umami.is/);
   - `{ provider: 'goatcounter', websiteId: 'my-goatcounter-id' }` (managed) or `{ provider: 'goatcounter', websiteId: 'my-goatcounter-id', host: 'my-goatcounter-domain.com', scriptSrc: 'https://my-url.to/counter.js' }` (self-hosted) use [GoatCounter](https://goatcounter.com);
   - `{ provider: 'posthog', apiKey: '<your-posthog-project-apiKey>', host: '<your-posthog-host>' }`: use [Posthog](https://posthog.com/);