Add github actions on MR

[RMHogervorst]

Add actions on MR

• hugo checker https://github.com/marketplace/actions/hugochecker

              - name: HugoChecker
                uses: ChrisPrusik/HugoChecker@v6

• add spelling checker https://github.com/marketplace/actions/check-spelling

  
            - name: Check Spelling
              uses: check-spelling/check-spelling@v0.0.22

- see also #57 

          - name: Lychee Broken Link Checker
            uses: lycheeverse/lychee-action@v1.9.2