Document distro packages in user cookbook

[gavv]

Update https://roc-streaming.org/toolkit/docs/building/user_cookbook.html

Rename "Linux (native)" to "Linux (from source)".

Add new section "Linux (from packages)", and add instructions for:

• [x] Ubuntu / Debian (github assets)
• [x] Fedora
• [x] Arch Linux
• [x] Alpine Linux

See https://repology.org/project/roc-toolkit/versions