Upgrade the documentation

[krazyjakee]

The documentation is "not meaningful". I totally agree.

• [x] Update GDScriptify2 to support gdscript 2 features such as getters/setters
• [x] The output md files should conform to a format for use in the something like Hugo
• [ ] Have the option to add additional pages using markdown and make them part of the final output
• [x] Create a flow to automatically generate documentation and push to gh-pages