Increase default max size and add troubleshotting page

[mapno]

What this PR does:

• Increase default values for server.grpc_server_max_recv_msg_size and server.grpc_server_max_send_msg_size from 4MB to 16MB
• Add a page in the troubleshot section for 500 Internal Server Error Body: response larger than the max (<size> vs <limit>) type of errors.

Checklist

• Tests updated
• Documentation added
• CHANGELOG.md updated - the order of entries should be [CHANGE], [FEATURE], [ENHANCEMENT], [BUGFIX]

[knylander-grafana]

Update looks good! Thank you for adding documentation.

[mdisibio]

This is great. What do you think about increasing the default for the frontend_worker to match?

[mapno]

This is great. What do you think about increasing the default for the frontend_worker to match?

This config is already at 100MB 🤯