Prepare repository for next .github release and SBT build improvements

[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).
• Move microsite files to microsite folder.
• Run github before ci-docs & ci-publish.
• 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.

Simplify SBT build

• Remove unneeded settings.
• Add sbt-remove-test-from-pom to avoid publishing test dependencies to POM.
• Add sbt-codecov to run tests with coverage and auto-upload to Codecov.

Update versions

• Update plugins to latest versions
• Update Scala versions to latest

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@bb4b035). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #185   +/-   ##
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  Coverage          ?   98.71%           
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  Files             ?       11           
  Lines             ?       78           
  Branches          ?        1           
=========================================
  Hits              ?       77           
  Misses            ?        1           
  Partials          ?        0           

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[gutiory]

LGTM!. Great job @alejandrohdezma 🎆