Updated Videos in Tutorials

[mdienst]

• Added a video of the wave propagation in a thin bar and
• Changed the embedding of mp4 files in tutorials to make them accessible in all browsers.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.34%. Comparing base (911f762) to head (1fbe0d4).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #172      +/-   ##
==========================================
- Coverage   90.39%   90.34%   -0.05%     
==========================================
  Files          43       43              
  Lines        4050     4050              
==========================================
- Hits         3661     3659       -2     
- Misses        389      391       +2     

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[kaipartmann]

LGTM

[kaipartmann]

The video of the tutorial is related to the question in the review #168.