DOC fix install guide link in 00-quickstart.ipynb

[turbotimon]

Summary

#installation-guide anchor does not exist. With the fix, it will point to the same target as in:

https://github.com/turbotimon/darts/blob/3a0f1f1474dc6b899daa5e4acc2a60b519794d3b/README.md?plain=1#L63

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[dennisbader]

Thanks for this fix @turbotimon 🚀

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.12%. Comparing base (093230a) to head (3e893ac).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2688      +/-   ##
==========================================
- Coverage   94.20%   94.12%   -0.08%     
==========================================
  Files         141      141              
  Lines       15569    15569              
==========================================
- Hits        14666    14654      -12     
- Misses        903      915      +12     

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