Fix GitHub Actions

[nrennie]

• Currently we have multiple GitHub Actions that try to commit files to the repo
• Any that finish running after the first one fails because "the remote contains work that you do not have locally"

Possible solutions:

• Pull changes before trying to commit in action
• Combine actions into one file
• Set README action to only run in very specific circumstances (when a new folder is added / folder renamed)

[henryjameslau]

Could run the readme and accessibility actions when the sitemap changes as the sitemap is looking for new index.htmls. And then combine the readme and accessibility into one action