* Fix ty unresolved-attribute warnings and stop globally ignoring them

Major changes:
- Convert BoundCommandFunc and UnboundCommandFunc TypeAliases in types.py to Protocol classes for stricter type checking
- Added `_NamedCallable` Protocol class in annotated.py for stricter type checking of function references
- Used `getattr` and/or `cast()` to help resolve some type errors in cmd2.py

Minor changes:
- Added type ignore for `ty:unresolved-attribute` to a number of places we were already ignoring `attr-defined` for mypy (problem of different name for same type of check)

* Update typos to 1.50.0
* Upgrade ruff to 0.15.6

This new version of ruff now auto-formats Python code blocks in Markdown files. The main changes applies are whitespace and converting single quotes to double quotes in our Python code blocks in the Markdown documentation.

I had to add a couple Markdown comments to turn formatting off and back on in some limited sections that use extra syntax for snippet inclusion that isn't supported by generic Markdown.

Bumps [github/codeql-action](https://github.com/github/codeql-action) from 4.37.8 to 4.37.9.
- [Release notes](https://github.com/github/codeql-action/releases)
- [Changelog](https://github.com/github/codeql-action/blob/main/CHANGELOG.md)
- [Commits](github/codeql-action@v4.37.8...v4.37.9)

---
updated-dependencies:
- dependency-name: github/codeql-action
  dependency-version: 4.37.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

With the release of Prek 0.5.1 they added stricter YAML validation and it chokes on the !ENV tags in our mkdocs.yml file.

We are still using Prettier for auto-formatting of YAML, this just bypasses Prek's YAML validation for this one file so that "make check" continues to pass without issues.

* First pass at updating readme

* Converted example in README.md to use with_annotated decorator

* Improved the organization of how cmd2's features are highlighted in the README.md

* Added animated gif of example app to the README

* Removed images that are no longer used in the README

* Update README.md to explictly state that cmd2 supports Typer-style syntax for specifying command arguments using type annotations

* Updated getting_started.md to more closely match the current state of the getting_started.py example

Also added a simple animated gif to that page.

* Replace README link with absolute link so it will work when uploaded to PyPI

Also:
- Fix casing of color when calling "set foreground color" in getting_started.md

* Address MR comments