Add yamllint config, fix some indentation

Signed-off-by: Adam Warner <me@adamwarner.co.uk>

.github/workflows/codespell.yml

@@ -1,4 +1,5 @@
 name: Codespell
+
 on:
   pull_request:
     types: [opened, synchronize, reopened, ready_for_review]
@@ -8,12 +9,12 @@ jobs:
     if: github.event.pull_request.draft == false
     runs-on: ubuntu-latest
     steps:
-    -
-      name: Checkout repository
-      uses: actions/checkout@v3
-    -
-      name: Spell-Checking
-      uses: codespell-project/actions-codespell@master
-      with:
-        ignore_words_file: .codespellignore
-        skip: ./scripts/vendor,./style/vendor
+      -
+        name: Checkout repository
+        uses: actions/checkout@v3
+      -
+        name: Spell-Checking
+        uses: codespell-project/actions-codespell@master
+        with:
+          ignore_words_file: .codespellignore
+          skip: ./scripts/vendor,./style/vendor