Update source links in MD files to use relative links

[weshaggard]

For our README's and CHANGELOG's we should update the links to follow the guidelines at https://github.com/Azure/azure-sdk/blob/master/docs/policies/README-TEMPLATE.md#link-guidelines.

• Fix MD file links in the templates https://github.com/Azure/azure-sdk/search?l=Markdown&q=master&type=
• Fix MD file links in .NET https://github.com/Azure/azure-sdk-for-net/search?l=Markdown&q=master&type=
• Fix MD file links in Java https://github.com/Azure/azure-sdk-for-java/search?l=Markdown&q=master&type=
• Fix MD file links in JS https://github.com/Azure/azure-sdk-for-js/search?l=Markdown&q=master&type=
• Fix MD file links in Python https://github.com/Azure/azure-sdk-for-js/search?l=Markdown&q=master&type=
• Update release process to translate the absolute master links in the generated docs from the artifacts to be absolute release tag links and add check to not allow any relative links in the .MD files

[KarishmaGhiya]

@weshaggard @sima-zhu
I think we should update the last todo from
Update release process to translate relative links in README and CHANGELOG files to be absolute based on the release tag
TO
Update release process to translate the absolute master links in the generated docs from the artifacts to be absolute release tag links and add check to not allow any relative links in the .MD files

[sima-zhu]

The issue is resolved by PRs:
Azure/azure-sdk-tools#926
Azure/azure-sdk-tools#895

Closed the issue for now. Please feel free to close it if anything left.