Add vulnerability exploiters' explanation pages

[shreyamalviya]

What does this PR do?

Fixes parts of #4213

TODO

• Rewrite some parts of Zerologon
• Add links to reference pages at the bottom
• Cross-check mitigations in each plugin's manifest file with the ones in the docs Decide an order for SNMP. The manifest's and the documentation's suggestions are slightly different. --- UPDATE: guardicode/snmp-exploiter#1

PR Checklist

• Have you added an explanation of what your changes do and why you'd like to include them?
• Is the TravisCI build passing?
• Was the CHANGELOG.md updated to reflect the changes?
• Was the documentation framework updated to reflect the changes?
• Have you checked that you haven't introduced any duplicate code?

Testing Checklist

• Added relevant unit tests?
• Do all unit tests pass?
• Do all end-to-end tests pass?
• Any other testing performed?

  Tested by {Running the Monkey locally with relevant config/running Island/...}

• If applicable, add screenshots or log transcripts of the feature working

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.97%. Comparing base (0d8a3e3) to head (a045c02).
Report is 4 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4247      +/-   ##
===========================================
- Coverage    77.07%   76.97%   -0.11%     
===========================================
  Files          442      430      -12     
  Lines        14135    13599     -536     
  Branches        18       18              
===========================================
- Hits         10895    10468     -427     
+ Misses        3240     3131     -109     

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