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/proselint/RASSyndrome.yml

@@ -0,0 +1,30 @@
+extends: existence
+message: "'%s' is redundant."
+level: error
+action:
+  name: edit
+  params:
+   - split
+   - ' '
+   - '0'
+tokens:
+  - ABM missile
+  - ACT test
+  - ABM missiles
+  - ABS braking system
+  - ATM machine
+  - CD disc
+  - CPI Index
+  - GPS system
+  - GUI interface
+  - HIV virus
+  - ISBN number
+  - LCD display
+  - PDF format
+  - PIN number
+  - RAS syndrome
+  - RIP in peace
+  - please RSVP
+  - SALT talks
+  - SAT test
+  - UPC codes