Change tab width for .go files to 4 (#11455)

* Change tab width for .go files to 4

I thing 8-wide tabs are kind of archaic and inconsisten with template
files which already use 4-wide.

Also did some misc cleanups in the .editorconfig files.

* add css

Co-authored-by: Lauris BH <lauris@nix.lv>

.editorconfig

@@ -1,4 +1,3 @@
-# http://editorconfig.org
 root = true
 
 [*]
@@ -10,23 +9,15 @@ end_of_line = lf
 [*.md]
 trim_trailing_whitespace = false
 
-[*.go]
-indent_style = tab
-indent_size = 8
-
-[*.{tmpl,html}]
+[*.{go,tmpl,html}]
 indent_style = tab
 indent_size = 4
 
-[*.less]
+[*.{less,css}]
 indent_style = space
 indent_size = 4
 
-[*.{yml,json}]
-indent_style = space
-indent_size = 2
-
-[*.js]
+[*.{js,json,yml}]
 indent_style = space
 indent_size = 2