Don't check PGP signature

[aaronraimist]

Running typos on https://github.com/matrix-org/matrix.org/blob/master/content/blog/wp-content/uploads/2016/07/predisclosure.signed.txt and https://github.com/matrix-org/matrix.org/blob/master/content/blog/wp-content/uploads/2018/09/signed_disclosure.txt results in

error: `Wya` should be `Way`
  --> ./content/blog/wp-content/uploads/2016/07/fulldisclosure.signed.txt:33:3
   |
33 | HFnWyaVVd6D+6qsrrbbsAqgh8Wy+MJE3cKmr1Ry2d4JByCoV8FCTxOWm0ZiWbEh8
   |    ^^^
   |
error: `Nd` should be `And`
  --> ./content/blog/wp-content/uploads/2016/07/predisclosure.signed.txt:23:22
   |
23 | kiBVZuvn9s+Q5NUwsP+9AtNdMDhWIMjrx4ZLVp8DXhK0bWFPanqGhKikjyFLAZg0
   |                       ^^
   |
error: `FO` should be `OF`, `FOR`
  --> ./content/blog/wp-content/uploads/2018/09/signed_disclosure.txt:26:26
   |
26 | XSAH3aRmdquCOWsw91JqeMeDi2FOBfiLUzkhzTVDVrPGbgS9Qqs=
   |                           ^^
   |

Related: #327

[epage]

Yes, we should see if we can detect these

[epage]

FYI #695 provides a new workaround for false positives