Auto-incrementing and auto-linking for blog versions

[hkailahi]

Now that blog versioning has been added to content layer, figure out the desired workflow.

• Should all modifications to mdx file increment version?

• How should auto-linking work? Ideally find a flow where versioning is abstracted away so no need for unnecessary builds, local/remote branches going out of sync, or basically anything manual needs to happen. (it's ok if local linking is fudged if it's documented)

• Should rendered version text box point to commit or PR on GH? Both? Conditional?

• What should major/minor revisions mean for this?

• Autoincrement versions

• Autolink versions to diff on github

• Build checks