Add glossary to documentation

[backmari]

Description of the changes

Add a glossary to the documentation and address other comments from the internal review.

Check all that apply:

• updated documentation
• Source added/refactored
• Added unit tests
• Added integration tests
• (If applicable) Verified that manual tests requiring the /SNS and /HFIR filesystems pass without fail

References:

• Links to IBM EWM items: Story 7562: [WebMon] Internal Review of WebMon Docs
• Links to related issues or pull requests:

Manual test for the reviewer

(Instructions for testing here)

Check list for the reviewer

• best software practices
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date
• code comments added when explaining intent

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.78%. Comparing base (462ed48) to head (be37490).

Additional details and impacted files

@@           Coverage Diff           @@
##             next     #202   +/-   ##
=======================================
  Coverage   77.78%   77.78%           
=======================================
  Files          54       54           
  Lines        4709     4709           
=======================================
  Hits         3663     3663           
  Misses       1046     1046           

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