Remove Vale Contractions rule

doc/.vale/gitlab/Contractions.yml

----
-# Suggestion: gitlab.Contractions
-#
-# Checks for use of common and uncommon contractions.
-#
-# For a list of all options, see https://errata-ai.gitbook.io/vale/getting-started/styles
-extends: substitution
-message: 'Use "%s" instead of "%s", for a friendly, informal tone.'
-link: https://docs.gitlab.com/ee/development/documentation/styleguide.html#language
-level: suggestion
-nonword: false
-ignorecase: true
-swap:
-
-  # Common contractions are ok
-  it is: it's
-  can not: can't
-  cannot: can't
-  do not: don't
-  have not: haven't
-  that is: that's
-  we are: we're
-  would not: wouldn't
-  you are: you're
-  you have: you've
-
-  # Uncommon contractions are not ok
-  aren't: are not
-  couldn't: could not
-  didn't: did not
-  doesn't: does not
-  hasn't: has not
-  how's: how is
-  isn't: is not
-  shouldn't: should not
-  they're: they are
-  wasn't: was not
-  weren't: were not
-  we've: we have
-  what's: what is
-  when's: when is
-  where's: where is
-  who's: who is
-  why's: why is