Add VitePress generation option, set as default

[WaitingIdly]

changes in this PR

• centralize missingLangKeys.
• remove documentation format from Admonition enum.
• remove #!groovy inline shebang from field explanation generation.
• changes the english text of the groovyscript.wiki.defaultPackage lang key.
• adds the ability to change what format code is generated in, set in Documentation.
• adds VitePress code generation, which generate with these main changes:
  • admonitions (here named "custom containers") have a start and end location, marked via some number of :, instead of just a start location. the format for determining color and symbol are also slightly changed.
  • code blocks for the Identifier focus the desired line
  • the !navigation.md files, which were used to generate the site map for the docs, are not needed here
• changes the default code generation to VITEPRESS. if changed back to MKDOCS_MATERIAL, should generate basically the same docs.

you can view the currently active VitePress docs here: https://cleanroommc.com/groovy-script/