Fix redirects in docs; make better warning about Numba

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.11%. Comparing base (aee67bb) to head (f76fdb6).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #850 +/- ## ======================================= Coverage 96.11% 96.11% ======================================= Files 48 48 Lines 9371 9371 ======================================= Hits 9007 9007 Misses 364 364 ```

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[matteobachetti]

@matteolucchini1 it should be done