Change docs and CI scripts to use pnpm tauri command (#1421)

* Change docs and CI scripts to use `pnpm tauri` command
 - Fix documentation and some scripts to use the new tauri subcommand following https://github.com/spacedriveapp/spacedrive/pull/1411 changes
 - Format/Lint some files

* Document new envvar to lauch devtools alongside the desktop app
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