Rename font-dejavusansmono-nerd-font→font-dejavu-sans-mono-nerd-font

[waldyrious]

This makes the filename more readable, and is consistent with font-dejavu-sans-mono-for-powerline.

Note that the other nerd-fonts fonts don't use a consistent nomenclature either: there are hyphen-separated cask names like font-fira-code-nerd-font, but also joined ones like font-robotomono-nerd-font. I'd be happy to add hyphens to the remaining ones as well, if that's acceptable.

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[vitorgalvao]

I'd be happy to add hyphens to the remaining ones as well, if that's acceptable.

It is. Thank you.