feat: Spellcheck docs when building

docs.yml is removed as `docs:verify` will cover spellchecks now.

.github/workflows/docs.yml

@@ -1,28 +0,0 @@
-name: Documentation Checks
-
-on:
-  push:
-    branches:
-      - develop
-    paths:
-      - 'packages/mermaid/src/docs/**/*'
-  pull_request:
-    branches:
-      - develop
-    paths:
-      - 'packages/mermaid/src/docs/**/*'
-jobs:
-  spellcheck:
-    name: 'Docs: Spellcheck'
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-        name: Check out the code
-      - uses: actions/setup-node@v3
-        name: Setup node
-        with:
-          node-version: '18'
-      - run: npm install -g cspell
-        name: Install cSpell
-      - run: cspell --config ./cSpell.json "packages/mermaid/src/docs/**/*.md" --no-progress
-        name: Run cSpell