docs: Update mkdocs and add dark mode

[carlspring]

Pull Request Description

This pull request closes #708 .

Acceptance Test

• Building the code with gradle clean build still works.

Questions

• Does this pull request break backward compatibility?

  • Yes and my commit follows the Conventional Commits Specification
  • No

• Does this pull request require other pull requests to be merged first?

  • Yes, please see #...
  • No

• Does this require an update of the documentation?

  • Yes, please see [provide details here]
  • No

Summary by CodeRabbit

• Documentation

  • Commented out license text in Apache 2.0 and a line in the main documentation index.
  • Updated MIT license text inclusion method.
  • Adjusted theme settings, plugin configurations, markdown extensions, social links, and navigation structure in mkdocs.yml.

• Chores

  • Upgraded image version in docker-compose.yml to squidfunk/mkdocs-material:9.
  • Updated various dependencies in requirements.txt.

[carlspring]

@coderabbitai review