v0.1.0

Added

unity: configures the included unity project so that it can be opened cleanly.
ci: adds the generated mkdocs-material site folder (./site/) to the .gitignore
docs: adds styling/content to mkdocs-material site so that it is visually more in line with the Trouble Cat Studios website
docs: initial content for changelog management, continuous integration, deployment and openupm features is added.

Fixed

docs: getting started documentation git flow graph is more readable in dark mode.
docs: github-style markdown callouts no longer render as block comments.

Changed

ci: build workflow only runs if the Editor or Runtime code files change
ci: docs workflow is moved to a composite action
ci: docs action uses mike to deploy seperate documentation updates for each released version. See the versioning documentation on material for mkdocs' website for more information.
upm: reduces minimum build version in OpenUPM config to 0.0.1
docs: getting started documentation includes branch naming convention guidelines.
docs: getting started documentation includes tips for submitting pull requests.
docs: getting started documentation includes labeling details.

Removed

ci: removes the unused release-upm-manual workflow