Refactor with Vue & parcel. Add offline toggle. Add latency dashboard. Add group renaming.

[zopieux]

Left to do:

• [ ] Better CSS for switching client group & deleting client
• [ ] Better navbar CSS (Show offline & dash/latency)
• [ ] Consider switching to SVG icons

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+6,999 - 5,467 (yarn lock) = 1,532 additions ⋅ 1,149 deletions = ~400 new lines