Mention support for Cilium Network Policy in doc

[2ez4szliu]

Issue #, if available:

Description of changes:

1. Call out Cilium NP support
2. Re-structure the list of supported features.
3. Remove some features in advanced features list

Testing (if applicable):

Documentation added/planned (if applicable):

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.58%. Comparing base (dc0984a) to head (fec2164).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10495   +/-   ##
=======================================
  Coverage   69.58%   69.58%           
=======================================
  Files         670      670           
  Lines       40699    40699           
=======================================
  Hits        28320    28320           
  Misses      10668    10668           
  Partials     1711     1711           

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