Refreshed logos - cleanup

[erogluorhan]

Overview

• Remove blue logos (we decided to use only horizontal and vertical layout logos with white and black "xarray" texts),
• Rename dark and light logos ("h_dark" --> uxarray_logo-h-dark etc.),
• Remove the older temporary logo (it's now archived in the drive)
• Use website color scheme dependent logo themes, i.e. if dark website use white text logo, or vice versa

PR Checklist

General

• Add appropriate labels
• Filled out the Overview section

[philipc2]

In the logo rename, there's a mixture of _ and - in the name.

uxarray_logo-h-dark.svg

I'd suggested one of the following options, with no preference.

uxarray_logo_h_dark.svg

or

uxarray-logo-h-dark.svg

[erogluorhan]

In the logo rename, there's a mixture of _ and - in the name.

uxarray_logo-h-dark.svg

I'd suggested one of the following options, with no preference.

uxarray_logo_h_dark.svg

or

uxarray-logo-h-dark.svg

You're right; done it now with all underscores.

[philipc2]

These changes are great! Tested out the Light/Dark switching on both the README and ReadTheDocs and both are working as expected. Thanks for cleaning this up!