Enable vale for prose linting (#3)

* Enable vale in CI

* Add vale config

* Tweak vale

* Update config

* Update .gitignore

* Switch back

* Rename CI

* Add badges

* Tidy up CI

* Change image

* Configure vale

* Delint

* Update README

.github/styles/RedHat/RepeatedWords.yml

@@ -0,0 +1,16 @@
+---
+extends: repetition
+message: "'%s' is repeated."
+level: warning
+link: https://redhat-documentation.github.io/vale-at-red-hat/docs/main/reference-guide/repeatedwords/
+ignorecase: false
+alpha: true
+action:
+  name: edit
+  params:
+    - regex
+    - '(\w+)(\s\w+)' # pattern
+    - "$1" # replace
+tokens:
+  - '[^\s\.]+'
+  - '[^\s]+'