Update README.md

[natalijabujevic0708]

Add conatinerization branch info
Remove unused header from Table of Contents

Description

Add conatinerization branch info
Remove unused header from Table of Contents

Fixes # (Tag or link relevant issues)

Type of Change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please include test coverage results that cover the changes referenced in the PR description.

Checklist:

• I have performed a self-review of my code
• I have commented my code, remember, these are resources to help developers identify patterns for HubSpot integrations
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules