Add common build errors & resolutions to the "build errors" documentation page.

[Ephraim-G]

The cloud.gov pages build error documentation could use a rework but for now there are a few common build errors that users run into that are undocumented. Having these issues visible in a public space will enable users to know what is occurring and take action, either through their own doing or via pages support.

Acceptance Criteria

• [ ] Create more robust error documentation by adding common engineer known/user reported issues.
• [ ] For each known issue state a way a user can remediate it or what support will have to do on their behalf

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Security considerations

Do not expose any secrets or confidential cloud.gov Pages data.

[apburnes]

Build errors are bit too unique for documentation