Add a simple tutorial for seismological new babies

[core-man]

We may have to update https://migg-ntu.github.io/MIG_Docs/seismology/ for new babies. Now we only have a simple list. I think we could add a few comments about those tutorials and a summary.

References:

• https://github.com/MIGG-NTU/SeisData_Tools
• https://github.com/MIGG-NTU/SeisTomo_Tutorials
• https://seismo-learn.org/seismology101/
• A workflow for seismological new babies SeisData_Tools#19