docs: adds Cortex as an adopter

[daniel-white]

What type of PR is this?

What this PR does / why we need it:

Adds Cortex to the list of adopters

Which issue(s) this PR fixes:

Fixes #

Release Notes: No

[arkodg]

LGTM thanks !

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.27%. Comparing base (096cb8d) to head (e7c282e).
Report is 31 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5798      +/-   ##
==========================================
+ Coverage   65.19%   65.27%   +0.07%     
==========================================
  Files         214      216       +2     
  Lines       34321    34627     +306     
==========================================
+ Hits        22377    22604     +227     
- Misses      10591    10637      +46     
- Partials     1353     1386      +33     

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