Fix link logic in documentation panel

[timroes]

The way links are currently handled in the documentation sidepanel for connectors is having several issues.

• It's not properly working for fragment-only URLs (quick fix preventing an app crash in Fix breaking the app with fragment links in docs #11312)
• Absolute URLs are turned into relative URLs within the airbyte application.
• Potential other edge cases not handled.

Problematic code: https://github.com/airbytehq/airbyte/blob/master/airbyte-webapp/src/views/Connector/ServiceForm/components/Controls/Instruction.tsx#L74-L79

[octavia-squidington-iii]

cc @airbytehq/frontend