docs(README): link CRDS PUB

[guspan-tanadi]

Resolves a link in main README

Closes #

This PR addresses CRDS PUB link user documentation in README

Checklist for PR authors (skip items if you don't have permissions or they are not applicable)

• added entry in CHANGES.rst within the relevant release section
• updated or added relevant tests
• updated relevant documentation
• added relevant milestone
• added relevant label(s)
• ran regression tests, post a link to the Jenkins job below.
  How to run regression tests on a PR
• All comments are resolved
• Make sure the JIRA ticket is resolved properly

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.23%. Comparing base (79b1da8) to head (9e87522).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8658   +/-   ##
=======================================
  Coverage   60.23%   60.23%           
=======================================
  Files         370      370           
  Lines       38636    38636           
=======================================
  Hits        23272    23272           
  Misses      15364    15364           

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[nden]

Thank you!