Adding links, and breaking down onboarding steps

[bobbravo2]

Description

Onboarding doc considerations, https://issues.redhat.com/browse/RHOAIENG-17027
This is to help new team members get an ext cluster configured with the frontend, to align the UI efforts with the broader infrastructure and RBAC changes that are planned for Q1.

How Has This Been Tested?

Local environment, validated the frontend against multiple backend clusters, via oc login and then cd frontend && npm start:dev:ext

Test Impact

No tests added due to this being primarily markdown and documentation updates for local development.

Request review criteria:

Reviewing the docs for clarity, as well as potential backend/or other test-cases for local DevEx would be very much appreciated!

Self checklist (all need to be checked):

• The developer has manually tested the changes and verified that the changes work
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has added tests or explained why testing cannot be added (unit or cypress tests for related changes)

If you have UI changes:
N/A

After the PR is posted & before it merges:

• The developer has tested their solution on a cluster by using the image produced by the PR to main

[openshift-ci]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.13%. Comparing base (ca83e34) to head (9b23056).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3606      +/-   ##
==========================================
- Coverage   85.15%   85.13%   -0.02%     
==========================================
  Files        1395     1395              
  Lines       32041    32041              
  Branches     8979     8979              
==========================================
- Hits        27283    27278       -5     
- Misses       4758     4763       +5     

see 3 files with indirect coverage changes

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