nvim: Update rust-tools to rustaceanvim

Also other stuff

tree/.config/nvim/lua/theme.lua

@@ -0,0 +1,33 @@
+-- setup must be called before loading the colorscheme
+-- Default options:
+require("gruvbox").setup({
+  terminal_colors = true, -- add neovim terminal colors
+  undercurl = true,
+  underline = true,
+  bold = true,
+  italic = {
+    strings = true,
+    emphasis = true,
+    comments = true,
+    operators = false,
+    folds = true,
+  },
+  strikethrough = true,
+  invert_selection = false,
+  invert_signs = false,
+  invert_tabline = false,
+  invert_intend_guides = false,
+  inverse = true, -- invert background for search, diffs, statuslines and errors
+  contrast = "", -- can be "hard", "soft" or empty string
+  palette_overrides = {},
+  overrides = {},
+  dim_inactive = false,
+  transparent_mode = false,
+})
+
+require('color-scheme')
+
+local color_scheme_file = "~/.cache/dotfiles/.config/nvim/lua/color-scheme.lua"
+require('fwatch').watch(color_scheme_file, "luafile " .. color_scheme_file)
+
+vim.cmd([[colorscheme gruvbox]])