[FIX] Ignore some dead links

[Remi-Gau]

• some are just false positive (twitter is not down... yet)
• some links ARE dead and my google fu is not good enough to find where the thing was moved (see #300)

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[Remi-Gau]

@yarikoptic if you want to have a look. the last CI fail for a broken was due to a website being under maintenance at the time of this PR

[yarikoptic]

dunno much about what is going on here -- changed link looks good. CI isn't happy due to different

FILE: _pages/benefits.md
[✖] https://central.xnat.org/ → Status: 0 Error: Parse Error: Expected HTTP/
    at TLSSocket.socketOnData (node:_http_client:542:22)
    at TLSSocket.emit (node:events:513:28)
    at addChunk (node:internal/streams/readable:324:12)
    at readableAddChunk (node:internal/streams/readable:297:9)
    at Readable.push (node:internal/streams/readable:234:10)
    at TLSWrap.onStreamRead (node:internal/stream_base_commons:190:23) {
  bytesParsed: 0,
  code: 'HPE_INVALID_CONSTANT',
  reason: 'Expected HTTP/',
  rawPacket: <Buffer 3c 21 44 4f 43 54 59 50 45 20 68 74 6d 6c 20 50 55 42 4c 49 43 20 22 2d 2f 2f 57 33 43 2f 2f 44 54 44 20 58 48 54 4d 4c 20 31 2e 30 20 54 72 61 6e 73 ... 11643 more bytes>
}

23 links checked.

ERROR: 1 dead links found!
[✖] https://central.xnat.org/ → Status: 0

[Remi-Gau]

I think the maintenance on the XNAT is over: link works now

merging