Remove misspell and update CONTRIBUTING.md

It looks like `misspell` is no longer maintained and
the last commit was on `Mar 9, 2018`.

We already run `codespell` and it is an active project
with the last commit 5 days ago.

Also updated the CONTRIBUTING guide with more
information on `pre-commit` as well as listed `codespell`
as the spell checker.

https://github.com/codespell-project/codespell
https://github.com/client9/misspell
https://github.com/client9/misspell/issues/197

.github/workflows/lint.yml

@@ -6,16 +6,6 @@ permissions:
   contents: read
 
 jobs:
-  misspell:
-    name: Check spelling with misspell
-    runs-on: ubuntu-latest
-    steps:
-      - name: "Checkout ${{ github.ref }} ( ${{ github.sha }} )"
-        uses: actions/checkout@v3
-      - name: Install
-        run: wget -O - -q https://git.io/misspell | sh -s -- -b .
-      - name: Run misspell
-        run: git ls-files --empty-directory | xargs ./misspell -error
   pre-commit:
     name: Run pre-commit
     runs-on: ubuntu-latest