Update 17 files

- /docs/sesion01/milab.md
- /docs/images/cuenca_rio_grande/.gitkeep
- /docs/images/sentinel_2/banda_3/.gitkeep
- /docs/images/sentinel_2/banda_4/.gitkeep
- /docs/images/sentinel_2/banda_8/.gitkeep
- /docs/images/sentinel_2/.gitkeep
- /requirements.txt
- /references.bib
- /notebooks.ipynb
- /markdown.md
- /markdown-notebooks.md
- /logo.png
- /LICENSE
- /_toc.yml
- /docs/intro.md
- /docs/images/cyted1.png
- /docs/images/upload.png