Documentation to help users embed Graph-Explorer

## Description

It is possible to embed Graph-Explorer within a webapp by using a reverse-proxy connection. This could be useful for many customers that want a shared GE experience. A detailed setup and walkthrough document on how to embed GE into a webapp would be useful for this experience.

## Preferred Solution

Documentation/Readme and walkthrough with the above details.

## Additional Context

## Related Issues

- #695
- maybe: #504

## Tasks

- [ ] Add documentation, include screenshots and walkthroughs

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Start by reviewing the existing Documentation/README material and related issues #695 and #504. Document the reverse-proxy setup for embedding Graph-Explorer in a web application, including a walkthrough and screenshots. The work is done when users can follow the documented setup to create the embedded experience.

Written by the indexing model from the issue text.