Move vale vocab main to dir that vale >=3.0.0 expects

[adit-chandra]

Per https://vale.sh/docs/keys/vocab:

In versions of Vale prior to 3.0, vocabularies were stored in /Vocab. When upgrading from an older version of Vale, you'll need to move your vocabularies to the new /config/vocabularies location.

Tested: successfully ran Vale 3.11.2 (latest) locally using the Viam vale.ini located in this repo.

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✅ npentrel
❌ adit-chandra
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