Update GHA badges on README.md

[jsiirola]

Fixes # .

Summary/Motivation:

This tracks a change in the URL GH uses for generating GHA badges. In addition, it refines the filter so that test results from fork builds of main are not reported as part of the badge. Finally it removes a redundant badge (doc url), whose status is reported as part of the "services" badge.

Changes proposed in this PR:

-Update URL for generating the "GitHub CI" badge, improve the filter to exclude fork builds

• Remove the "doc url" badge

Legal Acknowledgement

By contributing to this software project, I have read the contribution guide and agree to the following terms and conditions for my contribution:

1. I agree my contributions are submitted under the BSD license.
2. I represent I am authorized to make the contributions and grant the license. If my employer has rights to intellectual property that includes these contributions, I represent that I have received permission to make contributions and grant the required license on behalf of that employer.