chore: Remove contentful.

[jtfairbank]

Remove Contentful as a dependency, and related unused source files.

Makes progress on #170

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[jtfairbank]

@coderbyheart seems like the auto-format bot is going to have issues with data from Forestry, b/c Forestry commits directly to saga anyone branching off saga will have unformatted files in /content that the bot will try to clean up.

I'd recommend turning off formatting for /content/** to prevent this, or avoiding squashing commits so that the bots broader set of changes don't get squashed into the PR-specific changes.

[coderbyheart]

Yes, good idea.

[coderbyheart]

Done in fa8a538