docs: Page on how to modify report before sending

[MentalGear]

Added Page on how to use hook to modify reports.

[codecov[bot]]

Codecov Report

Merging #317 (1344e8d) into master (f7b84d5) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #317   +/-   ##
=======================================
  Coverage   55.55%   55.55%           
=======================================
  Files           1        1           
  Lines          27       27           
  Branches        8        8           
=======================================
  Hits           15       15           
  Misses          9        9           
  Partials        3        3           

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[rchl]

I've added https://sentry.nuxtjs.org/guide/user-feedback page to documentation so it should cover this case more or less.