scrub MNE name/logo/etc

[drammock]

this scrubs MNE from the assets/ folder and the README. There are a couple of TODOs:

• the README has a TBD link to a tutorial explaining how to use the installers. Maybe we should just comment that out for now?
• one of the post-install scripts links to an image "mne.png" which I'm not sure where it's coming from, so I'm not sure if just changing it to "scientific-python.png" is going to work. Maybe @larsoner can just pop in here and tell us?

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[drammock]

macOS install failures:

2025-05-12 21:26:32+00 Mac-1747083657516 package_script_service[5210]: ./postinstall: mv: rename /Applications/*(ScientificPython).app to /Applications/Scientific-Python/1.9.0_0/: No such file or directory
2025-05-12 21:26:32+00 Mac-1747083657516 package_script_service[5210]: ./postinstall: ERROR: could not run user-provided post_install script!

[larsoner]

I think it would be this:

https://github.com/conda-forge/mne-feedstock/blob/main/recipe/menu/mne.png

That's an asset that's part of the mne-installer-menus feedstock:

https://github.com/conda-forge/mne-feedstock/blob/08355b8a5cd76fec2ae7d4e3d16245fdc754da5a/recipe/meta.yaml#L122

So this post-install script knows that the mne-installer-menus will be installed, and that its mne.png will land in Menu/mne.png. So we'll need to see if there is some place we can get a scientific Python PNG... if not, then we could create a conda-forge feedstock for it. Not sure what conda-forge project / recipe we would want to create for it...

[drammock]

commits here have been cherry-pick incorporated into #3