[fish] install fisher if not available

config/fish/config.fish

@@ -48,3 +48,10 @@ if type -q fzf
         fzf_configure_bindings --directory=\cf --git_status=\cg
     end
 end
+
+if not functions -q fisher
+    echo "Installing fisher for the first time..." >&2
+    set -q XDG_CONFIG_HOME; or set XDG_CONFIG_HOME ~/.config
+    curl https://git.io/fisher --create-dirs -sLo $XDG_CONFIG_HOME/fish/functions/fisher.fish
+    fisher
+end

config/nvim/lua/plugins/null-ls.lua

@@ -146,7 +146,6 @@ return {
 						"scss",
 						"less",
 						"html",
-						"json",
 						"jsonc",
 						"yaml",
 						"graphql",