Include module README.md files in wiki generation

[KernelDeimos]

The script at tools/genwiki/main.js uses the file walked to traverse markdown files which have a parent directory named doc and add then to the wiki (included in the repo as a git submodule). However, Puter modules also have a README.md file in their directories which would be a nice addition to the wiki as well. The task of this issue is to update wiki generation to include these files in a way that's intuitive when someone is navigating the wiki.

[KernelDeimos]

@TanCodeX

[TanCodeX]

Love to work on this. Thank you!