Prepare repository for next .github release, SBT build improvements and fix microsite creation

[alejandrohdezma]

What has been done in this PR?

Prepare project for next .github release

• Add ci-publish command alias that will be used instead of ci-release for publishing artifacts.
• Move docs templates to docs folder (as mdoc is expected).
• Run github before ci-docs.
• Remove ci-microsite (it gets inline in ci-docs).
• Add actions.yml file that will be used by next .github release workflows to read pre/post conditions to run before/after ci-* commands.'

Fix the plugin's own microsite creation

• Since this project began using itself in its own build, instead of using the previously released version, its microsite got broken.
  • First, we need to add the same code added for using the plugin sources, but for the plugin resources.
  • Then, since this resources won't come from a JAR file, we can't use copyJARResourcesTo. Add a condition to use copyFilesRecursively as a fallback.

Simplify SBT build

• Re-order settings.
• Remove unneeded settings.
• Remove old sbt-org-policies markers.
• Add sbt-remove-test-from-pom to avoid publishing test dependencies to POM.

Update versions

• Update plugins to latest versions

[juanpedromoreno]

🚀