message: Update the main page of the doc
diff: \cite edgecollapsesocg2020.
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  - <b>Author:</b> Siddharth Pritam<br>
  + <b>Author:</b> Siddharth Pritam, Marc Glisse<br>
  <b>Introduced in:</b> GUDHI 3.3.0<br>
  - <b>Copyright:</b> MIT<br>
  - <b>Requires:</b> \ref eigen
  + <b>Copyright:</b> MIT
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