Knowledge Center error guide (2847)

[reitermb]

Summary of Changes

Closes #2847

Deliverable 4: Accessible

• [x] Does this PR complete the epic?
• [ ] Are links included to any other gov-approved PRs associated with epic?
• [x] Does PR include documentation for Raft's a11y review?
• [ ] Did automated and manual testing with iamjolly and ttran-hub using Accessibility Insights reveal any errors introduced in this PR?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.05%. Comparing base (0326896) to head (00ac3d1).

Additional details and impacted files

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[reitermb]

Noting that the PR is now updated with preliminary language for new email notifications for (demo-able in the Test environment as well https://reitermb.github.io/Test/knowledge-center/about-email-notifications.html). Revisions for error guide content will follow for next week's UX sync!

cc @ADPennington @lfrohlich

[reitermb]

Back over to QASP! @ADPennington @ttran-hub

I'll be adding a couple more commits tomorrow to clean up spacing between various subsections a little but all the content from GitBooks should be over here now and my initial a11y scan is coming up clean!

Noting that I also found and fixed two missing links over on the submission history guide.

All staged in the Test environment here: https://reitermb.github.io/Test/knowledge-center/viewing-error-reports.html

[reitermb]

One more clean a11y scan post-changes