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/write-good/Weasel.yml

@@ -0,0 +1,29 @@
+extends: existence
+message: "'%s' is a weasel word!"
+ignorecase: true
+level: warning
+tokens:
+  - clearly
+  - completely
+  - exceedingly
+  - excellent
+  - extremely
+  - fairly
+  - huge
+  - interestingly
+  - is a number
+  - largely
+  - mostly
+  - obviously
+  - quite
+  - relatively
+  - remarkably
+  - several
+  - significantly
+  - substantially
+  - surprisingly
+  - tiny
+  - usually
+  - various
+  - vast
+  - very