Fix description of the gridded bathymetry data format in docs

[andrewwinters5000]

The discussion of the bathymetry data format was transposed, which this PR corrects. Also, it is possible to use a BOTTOM_TOPOGRAPHY block and sizer to create a 2D mesh as well. One just needs to remove the EXTRUSION block from the control file. The docs should be updated appropriately to highlight that this feature works in 2D as well.

[codecov[bot]]

Codecov Report

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

Project coverage is 75.87%. Comparing base (cd90cf0) to head (839530e). Report is 1 commits behind head on main.

Additional details and impacted files

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[ranocha]

The docs should be updated appropriately to highlight that this feature works in 2D as well.

Do you want to do this here as well?

[andrewwinters5000]

The docs should be updated appropriately to highlight that this feature works in 2D as well.

Do you want to do this here as well?

Yes, I want to do that in this PR as well. I just want to touch base with David for the best place to make the modifications.

[DavidAKopriva]

Yeah, I think so. I can modify the parts about using the topography for 2D sizing, and I'll leave it to Andrew to fix the parts on the data format.

[DavidAKopriva]

I added text to the section on topography that say it can be used to size a 2D mesh. At this point things seemed unwieldy, since it's described on the 3D meshing page. I guess it should be moved to the model page since that's where it is defined. In the meantime, I added a tl;dr section to the top of the introduction, index, and Readme pages entitled "What you can do with HOHQMesh" that has links to different sections. I need to figure out how to link to a section of a page, since appending #xxxx to the page doesn't seem to work from outside the page. I also need to figure out how to include a file so that the tl;dr is only in one place. Anyway, I kind of like having this addition, and comments are solicited.

[DavidAKopriva]

OK, then why don't we have this merged. It doesn't change the code any, so it can remain at its current version, right?

[andrewwinters5000]

Yes, this only changed the docs. So, nothing needs to be done with versioning.