[Csnd-dev] restructuring the download page

hi all -

currently we have at https://csound.com/download.html these categories:
|- Desktop
| |- Windows installers
| |- Mac
| |- Linux
|- Mobile and web
| |- Android App and SDK
| |- iOS SDK
| |- WASM
|- Other
| |- csound~ (Win and Mac)
| |- Sources
| |- Older

i think we have a couple of issues here:
1. missing parts like csound6~ for PD, ctcsound etc
2. frontends are missing
3. categories are problematic

i guess this will never be perfect.  but after i understood how the site 
works, i can perhaps start with better categories.  what about this:

|- Binaries and installers
| |- Windows
| |- Mac
| |- Linux
| |- Android
| |- WASM
|- Interfaces
| |- Android SDK
| |- iOS SDK
| |- csound6~ for PD
| |- csound~ for Max (old and new version)
| |- ctcsound
|- Sources, Versions, Documentation
| |- Sources
| |- Older Versions
| |- Documentation
|- Frontends
| |- Cabbage
| |- CsoundQt
| |- Blue

thanks for any feedback -
	joachim