Add cascading metadata

[AaronCrawfis]

Description

Adds cascading metadata so the docs GitHub links work as expected in the sidebar

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to
implementation.

Partially fixes dapr/docs#1895

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Tests pass
• Created/updated tests
• Extended the documentation

[codecov-commenter]

Codecov Report

Merging #138 (aacaa7c) into main (d17e37e) will increase coverage by 0.32%.
The diff coverage is n/a.

❗ Current head aacaa7c differs from pull request most recent head ce9c398. Consider uploading reports for the commit ce9c398 to get more accurate results

@@             Coverage Diff              @@
##               main     #138      +/-   ##
============================================
+ Coverage     73.48%   73.80%   +0.32%     
  Complexity      562      562              
============================================
  Files            72       72              
  Lines          1746     1718      -28     
============================================
- Hits           1283     1268      -15     
+ Misses          463      450      -13     

see 10 files with indirect coverage changes

[msfussell]

LGTM