Contribute fix

[Chilipp]

• Closes A few broken links in the documentation #4

[codecov]

Codecov Report

Merging #7 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #7   +/-   ##
=======================================
  Coverage   88.17%   88.17%           
=======================================
  Files          26       26           
  Lines       11313    11313           
=======================================
  Hits         9975     9975           
  Misses       1338     1338

---

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[codecov]

Codecov Report

Merging #7 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #7   +/-   ##
=======================================
  Coverage   88.21%   88.21%           
=======================================
  Files          26       26           
  Lines       11247    11247           
=======================================
  Hits         9922     9922           
  Misses       1325     1325

---

Continue to review full report at Codecov.

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[Chilipp]

This PR is ready to be merged. It fixes the broken links in the CONTRIBUTING file and in the docs. It will be merged if @ixjlyons approves the changes. The fixed contribution guidelines are accessible via https://straditize.readthedocs.io/en/contribute-fix/contribute.html and in the github branch (https://github.com/Chilipp/straditize/blob/contribute-fix/CONTRIBUTING.md)