add what is security in depth page

[ilayda-cp]

Done

add what is security in depth page
https://docs.google.com/document/d/1lFW0x-emo_zC_qByxKgvaDtBOYqx_I_6eGMKCY8yOUo/edit?tab=t.at2t5x1z3l7b

QA

• open https://canonical-com-2519.demos.haus/knowledge/security-and-compliance/what-is-security-in-depth
• verify all the changes applied to the page

Issue / Card

Fixes https://warthogs.atlassian.net/browse/WD-35343

[webteam-app]

Demo

Jenkins

demos.haus

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.65%. Comparing base (0e0234d) to head (96fe63a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2519   +/-   ##
=======================================
  Coverage   78.65%   78.65%           
=======================================
  Files          16       16           
  Lines        1940     1940           
=======================================
  Hits         1526     1526           
  Misses        414      414           

Flag	Coverage Δ
python	78.65% <ø> (ø)

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[steverydz]

Looks good other than one missing link. I'll approve with changes.