Improve GitHub action (#2364)

* Add YAML linter

* Drop GitHub registry login as its not required at this point

* Add YAML document start marker

* Fix YAMLlint issues

* Fix YAMLlint issues in .github yaml files

* Fix YAMLlint issue in .github/dependabot.yml

* Remove .github/move.yml

* Set dependabot to weekly

Co-authored-by: Joakim Sørensen <hi@ludeeus.dev>

* Use YAML strip option where appropriate

* Fix multiline string

Co-authored-by: Joakim Sørensen <hi@ludeeus.dev>

nginx_proxy/build.yaml

@@ -1,3 +1,4 @@
+---
 build_from:
   aarch64: ghcr.io/home-assistant/aarch64-base:3.14
   amd64: ghcr.io/home-assistant/amd64-base:3.14

nginx_proxy/config.yaml

@@ -1,3 +1,4 @@
+---
 version: 3.1.1
 hassio_api: true
 slug: nginx_proxy