* De-incubation cleanup in code, docs, packaging

* remove unused docs script

It is no longer really relevant in the world we have of committing
via merge-and-squash.

* Add committer_readme.md

* Clean up

* Update, add PR merge action checklist

* Move dev-related docs and files except CONTRIBUTING.md to dev/ directory; More committer's intructions

* Add some accents

* Move TeamCity instruction images to teamcity-images/, edit CONTRIBUTING.md

* Add links to tags

* add missing license headers, in particular to MD files; clean up RAT exclusions

* revert inadvertent doc changes

* docs

* cr changes

* fix modified druid-production.svg

* Rename io.druid to org.apache.druid.

* Fix META-INF files and remove some benchmark results.

* MonitorsConfig update for metrics package migration.

* Reorder some dimensions in inner queries for some reason.

* Fix protobuf tests.

* Update git workflow

Make Git workflow more elaborate. Fix enumeration. Emphasize what to do on conflicts with master.

* Fix

Some changes to the contributing guidelines to make pull requests
easier to review.