This change implements yamllint and adjusts all yaml files to abide by our linting setup. This excludes config.template.yml as this will be done in an alternate commit.
* [CI] Exclude non-coverage files from codecov upload
* Ignore React serviceWorker.ts for coverage
As we do not utilise service workers in React gives more accurate coverage percentages when ignored.
* [CI] Add Codecov support
* [CI] Capture backend coverage from integration tests
* [CI] Remove unnecessary artifacts for coverage build
* [CI] Only run coverage elements where necessary
* [CI] Simplify post-command hook
* Fix yarn dependencies and collect coverage
* [CI] Include cmd/authelia/ path in coverage
* [CI] Exclude internal/suites/ in coverage
Closes#1061.
