Upgrade the documentation

[krazyjakee]

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

• Update GDScriptify2 to support gdscript 2 features such as getters/setters
• 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
• Create a flow to automatically generate documentation and push to gh-pages