docs: Add architecture diagram to website

[pmengelbert]

Signed-off-by: Peter Engelbert [email protected]

What this PR does / why we need it: Adds a high-level diagram of Eraser's architecture

Which issue(s) this PR fixes (optional, using fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when the PR gets merged): Fixes #399

[sozercan]

can we replace Qualys (since it doesn't exist) with Other providers or something?

[codecov-commenter]

Codecov Report

Merging #431 (16427be) into main (ff8727f) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #431   +/-   ##
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  Coverage   13.86%   13.86%           
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  Files          12       12           
  Lines        1248     1248           
=======================================
  Hits          173      173           
  Misses       1057     1057           
  Partials       18       18           

Flag	Coverage Δ
unittests	13.86% <ø> (ø)

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