Integrate documentation overhaul (#51)

* Update contributors documentation

* Update README.md

Co-authored-by: Stasiek Michalski <hellcp@opensuse.org>

Author: dylanwh

.github/pull_request_template.md

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+#### Details
+<!-- Explain what you did -->
+This PR fixes/adds a feature...
+
+#### Additional info
+* [bmo#](https://bugzilla.mozilla.org/show_bug.cgi?id=)
+
+#### Test Plan
+<!-- How did you verify the fix/feature in steps -->
+1. Open the show_bug view
+2. Edit the bug
+3. ...

README.md

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+![Banner](images/banner.png)
+# Bugzilla Harmony [![CircleCI Status](https://circleci.com/gh/bugzilla/harmony/tree/master.svg?style=shield)](https://circleci.com/gh/bugzilla/harmony/tree/master) [![New Issue on Bugzilla](https://img.shields.io/badge/new%20issue-on%20bugzilla-blueviolet?style=flat)](https://bugzilla.mozilla.org/enter_bug.cgi?product=Bugzilla&format=__default__ "Report a new issue") [![Chat on Matrix](https://img.shields.io/badge/chat-on%20matrix-blue?style=flat&icon=matrix)](https://matrix.to/#/#bugzilla:mozilla.org)
+
+**Web based general purpose defect tracking software that helps to drive
+software development.**
+
+Stable and reliable, tested by thousands of largest open source
+organizations all around the world. It can be installed on Linux, mac OS,
+other flavors of Unix and Windows.
+
+For the full list of features, you can check the
+[Bugzilla website](https://www.bugzilla.org/features/).
+
+## Demo
+
+You can try Bugzilla on the
+[test instance](https://bugzilla-dev.allizom.org)
+
+![Screengrab](images/bzgif.gif)
+
+## Development
+
+If you want to contribute to Bugzilla, you can fork this repo and get a
+local copy of it running in a few minutes using Docker with the help of
+the [guide](docker/development.md).
+
+Make yourself familiar with [CONTRIBUTING.md](CONTRIBUTING.md), so your
+PR gets quickly and swiftly through the review process.
+
+## Installation
+
+You can use the provided docker container to set up Bugzilla, which is
+documented in [docker/README.md](docker/README.md).
+
+For other ways of installing Bugzilla, refer to our
+[installation documentation](https://bugzilla.readthedocs.io/en/latest/installing/index.html).
+
+## Documentation
+
+* [Main documentation](https://bugzilla.readthedocs.io)
+* [Developer resources](https://www.bugzilla.org/developers/)
+
+## Reporting Bugs
+
+You can report bugs on the
+[Mozilla Bugzilla](https://bugzilla.mozilla.org/enter_bug.cgi?product=Bugzilla&format=__default__)
+
+## Community
+
+* [#bugzilla on Freenode](irc://irc.mozilla.org/bugzilla)
+* [Matrix](https://matrix.to/#/#bugzilla:mozilla.org)
+* [Twitter](https://twitter.com/bugzilla)
+* [Development Forum](https://www.mozilla.org/en-US/about/forums/#dev-apps-bugzilla)
+* [Support Forum](https://www.mozilla.org/en-US/about/forums/#support-bugzilla)
+* [Code of Conduct](CODE_OF_CONDUCT.md)
+* [Website](https://www.bugzilla.org)