Add a profanity test to Vale

Add a list of common British and English profanity to a Vale test.

doc/.vale/gitlab/Profanity.yml

+---
+extends: existence
+message: "Remove profanity: '%s'"
+ignorecase: true
+level: error
+tokens:
+  - 'arse(hole)?'
+  - 'ass(hole)?'
+  - 'bastard'
+  - 'bitch'
+  - 'bloody'
+  - 'bollocks'
+  - 'bugger'
+  - 'cocksucker'
+  - 'crap'
+  - 'cunt'
+  - 'damn'
+  - 'eff(ing)?'
+  - 'fart'
+  - 'fuck(er|ing)?'
+  - 'goddamn(it?|ed)'
+  - 'hell'
+  - 'horseshit'
+  - 'motherfuck(ers?|ing)'
+  - 'piss(ing)?'
+  - 'shit'
+  - 'tits'
+  - 'turd'
+  - 'twat'
+  - 'wank(er|ing)?'