Update documentation to more clearly outline options for triggering the publish CI job

It would be helpful to add some additional documentation to CONTRIBUTING.md outlining all available options for triggering the publish CI job using our semantic versioning

Things to include/Questions:

• We use fix: <commit message> as our semantic PATCH
• We use feat: <commit message> as our semantic MINOR
• Not sure whether we have anything set up to correlate to semantic MAJOR (maybe BREAKING CHANGE: <commit message>)
• Would be good to note as well that the merge request (MR) title becomes the commit message when merging with squash enabled, so in those cases the commit message itself is less important than the MR title.