[TST] Fix link in docs and deprecated function from numpy

[matteobachetti]

A very easy one. The link timelabtechnologies.com is unreacheable, and I'm eliminating it from the docs (otherwise the linkcheck test fails)

Also, fix deprecation warning of numpy.trapz in numpy 2.0

[codecov[bot]]

Codecov Report

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

Project coverage is 96.53%. Comparing base (13881e4) to head (3544643).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #830 +/- ## ========================================== - Coverage 96.54% 96.53% -0.01% ========================================== Files 48 48 Lines 9253 9257 +4 ========================================== + Hits 8933 8936 +3 - Misses 320 321 +1 ```

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