(#426) Add Common Errors page

[corbob]

Description Of Changes

This adds a Common Errors page for CCR documentation.

Motivation and Context

Document the known HTTP error responses from CCR to help users identify reasons for push failures.

Testing

• I have previewed these changes using the Docker Container or another method before submitting this pull request.

Change Types Made

• Minor documentation fix (typos etc.).
• Major documentation change (refactoring, reformatting or adding documentation to existing page).
• New documentation page added.
• The change I have made should have a video added, and I have raised an issue for this.
  • Issue #

Change Checklist

• Requires a change to menu structure (top or left-hand side)/
• Menu structure has been updated
• Images added to the img repository?
  • PR -

Related Issue

Fixes #426