Docker setup documentation

[kmcginnes]

Description

Updated the documentation to better describe the docker setup and reformatted other parts of the documentation to improve readability.

Also, fixed the log message when the Express server starts.

Validation

• Read through the documentation changes.
• Verify the steps in the documentation work as intended
• Run the proxy server to see the updated log message

Related Issues

• Addresses #405
• Addresses #407
• Addresses #402

Check List

• [x] I confirm that my contribution is made under the terms of the Apache 2.0 license.
• [x] I have run pnpm checks to ensure code compiles and meets standards.
• [x] I have run pnpm test to check if all tests are passing.
• [ ] I have covered new added functionality with unit tests if necessary.
• [x] I have added an entry in the Changelog.md.

[codecov[bot]]

Codecov Report

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

Project coverage is 14.91%. Comparing base (361c4ba) to head (625853e). Report is 21 commits behind head on main.

:exclamation: Current head 625853e differs from pull request most recent head 1933d13

Please upload reports for the commit 1933d13 to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #416 +/- ## ========================================== + Coverage 13.97% 14.91% +0.93% ========================================== Files 414 415 +1 Lines 30639 30809 +170 Branches 878 946 +68 ========================================== + Hits 4283 4595 +312 + Misses 26026 25886 -140 + Partials 330 328 -2 ``` | [Flag](https://app.codecov.io/gh/aws/graph-explorer/pull/416/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/aws/graph-explorer/pull/416/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws) | `14.91% <ø> (+0.93%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws#carryforward-flags-in-the-pull-request-comment) to find out more.

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