web: refresh the demo ROM story - gbos now serves IRC and HTTP

gbos picked up an IRC server (and httpd before it), which is a much better
advert for the lab than `ls`: one Game Boy runs the daemon, another connects
over the virtual switch. Verified on the live site end to end - GB0 `ircd &`,
GB1 `irc 10.0.0.2 gb1`, `/join #gb`, and the message lands:
`<gb1> hello from sl0p.foo`. The header now suggests exactly that, plus the
httpd/wget pair.

Two display fixes fell out of running it:

  - irc(1) is a colour client, so the console mirror was printing raw CSI
    sequences as "[44m[37m..." - the decoder dropped the ESC byte but kept
    the rest. It now tracks ESC / CSI state and discards the whole sequence.
    The LCD still renders the colours; only the plain-text mirror strips them.
  - the LCD is 40 columns, so full-width output (irc's status bar) arrives
    space-padded. The mirror isn't column-aligned, so it squeezes runs of
    whitespace and drops lines that were nothing but padding.

The ROM itself isn't vendored here (it's a build artifact of ~/dev/gbos that
deploy.sh ships), so this commit is the page copy and the decoder.

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