📖 removing duplicated content

[grokspawn]

Description

We have duplicate catalog web service access documentation in a few places:

• https://github.com/operator-framework/operator-controller/blob/main/docs/howto/catalog-queries.md (all endpoint)
• 📖 (docs) draft catalogd docs with new metas endpoint  #1841 (metas endpoint)

The howto fetching-catalog-contents.md adds nothing to the knowledgebase, and isn't integrated with other docs, so it represents a good pruning point for duplicate info.

This is the last work item needed to close#1783

Reviewer Checklist

• API Go Documentation
• Tests: Unit Tests (and E2E Tests, if appropriate)
• Comprehensive Commit Messages
• Links to related GitHub Issue(s)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.96%. Comparing base (fc88b93) to head (428435e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@## main #1879 +/- ##
==========================================
- Coverage 68.98% 68.96% -0.02% 
==========================================
Files 66 66 Lines 5243 5243 ==========================================
- Hits 3617 3616 -1 - Misses 1395 1396 +1 
Partials 231 231 

Flag	Coverage Δ
e2e	50.46% <ø> (-0.08%)	⬇️
unit	56.70% <ø> (-0.02%)	⬇️

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[anik120]

/lgtm