Update package integration docs + add steps

• Review and update package integration docs/links
• Added Big Bang MR step with all packages pipeline passing
• Added readme generation script reference and details to helm standards doc

For Issue

Closes #1926 (closed)

docs/developer/package-integration/README.md

@@ -15,3 +15,4 @@ The following documents should be followed, in order, to fully integrate a new p
 1. [Policy Enforcement](policy-enforcement.md): Update package to comply with default security and governance policies in Big Bang
 2. [Supported Package](supported.md): Migrate package into the Big Bang repo as a supported package
 3. [Final Documentation](documentation.md): Add additional Big Bang documentation for final release
+4. [Big Bang Merge Request](bigbang-merge-request.md): Create Big Bang Merge Request and run all packages pipeline.