docs: add "back up data!" note near File Explorer

perf: remove constant 3 second startup delay

refactor: fix comment

perf: `<link rel="preload"` for scripts, WASM

refactor: simplify `syncfs` usage

feat: allow clients to download resources from srv

improvement: change some default `.cfg` vars

improvement: add 3 bots instead of 4

refactor: remove .cfg line with a typo

fix: lightning gun beam visual in demoq3

improvement: same game logic files in all games

feat: bring back autoattack on mobile

feat: Unlagged mod (and more) for demoq3

refactor: remove `ztm-flexible-hud-r8-COPYING.txt`

improvement: keep printing MOTD on game start