* Improve the Exporting for the Web section.
Add "Export Type" options (threads, gdnative, regular).
Add warnings about "secure contexts" limitations.
Mentions threads and GDNative requirements.
Mention WebRTC as a networking API.
General refactor.
* Update compiling for the Web.
Bump emscripten requirements, mention threads, gdnative and editor
build.
- Removed typographic marks in the entire repo
- Removed a line about why we don't use a wiki
- Indented notes with 4 spaces
- Addressed review comments