static-checks: Delete kata-spell-check

The old hunspell based spell-check was causing contributors
challenges and proving a barrier to doc updates. We've replaced
it with a cspell based-solution, so clean up the old approach.

Signed-off-by: stevenhorsman <steven@uk.ibm.com>

.github/workflows/static-checks.yaml

@@ -138,7 +138,7 @@ jobs:
           go-version: ${{ env.GO_VERSION }}
       - name: Install system dependencies
         run: |
-          sudo apt-get update && sudo apt-get -y install moreutils hunspell hunspell-en-gb hunspell-en-us pandoc
+          sudo apt-get update && sudo apt-get -y install moreutils
       - name: Install open-policy-agent
         run: |
           cd "${GOPATH}/src/github.com/${GITHUB_REPOSITORY}"