Rename, edit and link notebooks

[tcmetzger]

The purpose of this PR on my fork is to collect all remaining work to rename the tutorial notebook files, edit the notebooks for consistency, and create and update links between the notebooks.

[tcmetzger]

This first commit changes the filenames and numbers each notebook. The proximity and census notebooks are not included in this PR since they have not been merged yet. Since the notebooks were written as individual tutorials, I was not able to see a clear, natural order that they should be in.

This is the proposed order I have put the notebooks in:

1. Reprojecting and Resampling
2. Coregistration
3. Mosaikcking
4. Geospatial Classification
5. Local Tools
6. Focal Statistics
7. Surface Tools
8. Proximity Tools
9. Zonal Statistics
10. Census Data
11. Landcover Classification

The basic thoughts behind it:

• 1 to 4 are what appears to be basic operations that are used in many of the subsequent notebooks
• 5 to 9 are Operations that follow the categories of the Map Algebra Functions, covering Local Operations, Focal Operations, Global Operations, and Zonal Operations.
• The census data notebook might be considered similar to zonal statistics, as much of what happens there is defining and plotting zones
• The landcover notebook seems to be its own thing a bit since it introduces PyTorch.

EDIT: I switched the first and second notebook - the coregistration notebook does mention Reprojecting and Resampling, so Reprojecting and Resampling should come first.

[tcmetzger]

My most recent commit contains work on links. I have added a "Click on this link to go to the next notebook" link at the bottom of each notebook. I have also checked all internal and external links for broken links and fixed them all. I have also made sure that all notebooks now have some sort of table of contents in the intro paragraph with links to headlines in the notebook.

[tcmetzger]

The most recent commit takes care of consistent capitalization of "Xarray-Spatial" (the logo on https://xarray-spatial.org capitalizes both "X" and "S").

[tcmetzger]

My most recent two commits contain various edits for stylistic consistency, orthography, and interpunctuation. These edits are based on the Microsoft Writing Style Guide.

[tcmetzger]

cc @brendancol@marcozimmermannpm@thuydotm@nodell111