Update website footer to align with CNCF guidelines

[tsaarni]

Update the website footer to use the LF Projects, LLC disclaimer per CNCF website guidelines.

Fixes #7527

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.32%. Comparing base (c487f80) to head (a9b07e8).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7528      +/-   ##
==========================================
+ Coverage   81.49%   82.32%   +0.83%     
==========================================
  Files         130      130              
  Lines       19511    15624    -3887     
==========================================
- Hits        15900    12863    -3037     
+ Misses       3328     2478     -850     
  Partials      283      283              

see 125 files with indirect coverage changes

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