Document option for installing CRDs from a single remote yaml

[shaun-nx]

Proposed changes

This PR updates our installation with manifest docs to include the option for installing our CRDs from a single yaml file through a remote
URL.

Additional changes:

• Remove steps to cd into deployments directory. This is because not all relevant manifests are in that directory now.
• Add additional context for using installing CRDs using a URL.
• Explicitly call out the need to clone the repo when not installing CRDs using a URL.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (37897fc) 52.06% compared to head (d2e768f) 52.09%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4730      +/-   ##
==========================================
+ Coverage   52.06%   52.09%   +0.02%     
==========================================
  Files          59       59              
  Lines       17033    17033              
==========================================
+ Hits         8869     8873       +4     
+ Misses       7864     7862       -2     
+ Partials      300      298       -2     

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[ADubhlaoich]

LGTM!