Remove link to resend mail.

[maxnoe]

• People probably don't remember anyway and just try to resend the form → get the button when trying to register again with the same mail
• Dean wanted to use formal language and the message clashed with the formal language in the description

[codecov-commenter]

Codecov Report

Merging #196 (04ecc7d) into main (65d6af5) will not change coverage. The diff coverage is n/a.

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@@           Coverage Diff           @@
##             main     #196   +/-   ##
=======================================
  Coverage   77.83%   77.83%           
=======================================
  Files          23       23           
  Lines        1060     1060           
=======================================
  Hits          825      825           
  Misses        235      235           

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