feat: add ID attrs to CTA

[britneywwc]

Blocked by canonical/vanilla-framework#5723

Done

• Bump vanilla to 4.38.0
• Add ID support to CTA section, as requested in copy doc

QA

• Go to /juju/charmhub-community#get-started
• See that the anchor link takes you to the CTA section

Issue / Card

Fixes #

Screenshots

[if relevant, include a screenshot]

[webteam-app]

Demo

Jenkins

demos.haus

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.20%. Comparing base (854f075) to head (2b46e68).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2128   +/-   ##
=======================================
  Coverage   77.20%   77.20%           
=======================================
  Files          16       16           
  Lines        1676     1676           
=======================================
  Hits         1294     1294           
  Misses        382      382           

Flag	Coverage Δ
python	77.20% <ø> (ø)

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