Fix kitty fonts

Hoo boy, a few unrelated fixes are in this simple change. First, remove
the italic and bold italic fallback to Menlo (since inconsolata doesn't
have italic support). In practice I never saw this - my vim colorscheme
was not setting italics for treesitter comments until
tinted-theming/tinted-vim#84. Once that issue
was solved, I unexpectedly started seeing line height conflicts due to
my terminal's Menlo fallback (https://xkcd.com/1172/).

I don't actually want italics in vim, so I'll just remove this fallback
in my kitty config instead.

Secondly, use inconsolata nerd font in kitty. I thought I was happy with
kitty's fallback to symbols-nerd-font to get symbols for NvimTree, but
this caused another size conflict.

Finally, don't specify regular/bold/etc, let kitty figure that out. I
confirmed with `kitty --debug-font-fallback` that its falling back on
regular for italics.

config/home/.config/kitty/kitty.conf

@@ -6,10 +6,10 @@
 #: individual font faces and even specify special fonts for particular
 #: characters.
 
-font_family      Inconsolata Regular
-bold_font        Inconsolata Bold
-italic_font      Menlo Italic
-bold_italic_font Menlo Bold Italic
+font_family      Inconsolata Nerd Font Mono
+bold_font        Inconsolata Nerd Font Mono
+italic_font      Inconsolata Nerd Font Mono
+bold_italic_font Inconsolata Nerd Font Mono
 
 #: You can specify different fonts for the bold/italic/bold-italic
 #: variants. The easiest way to select fonts is to run the `kitten