added the contact page of a tree to Disallow list in robots.txt

[BertKoor]

Inspection of my Google Search Console learned that google tried to index a lot of pages like:

https://stamboom.bertkoor.nl/tree/BertKoor/contact?to=bertkoor&url=https://stamboom.bertkoor.nl/tree/BertKoor/individual/**

The link in the footer of the Individual page itself has attribute rel="nofollow" but that is apparently not stopping Google.
It seems that google still does respect robots.txt, so let's add the contact page there.

Perhaps semantics have shifted in the last decades, and thus we should change all rel="nofollow" to rel="noindex,nofollow" but I'll leave that to others to decide.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 36.91%. Comparing base (a64cc99) to head (e753e94).
⚠️ Report is 138 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5422      +/-   ##
============================================
+ Coverage     35.49%   36.91%   +1.42%     
- Complexity    11211    11818     +607     
============================================
  Files          1166     1207      +41     
  Lines         48077    49601    +1524     
============================================
+ Hits          17065    18311    +1246     
- Misses        31012    31290     +278     

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