fix(dev): use indent_size of 4 by default

Author: xarvex

.editorconfig

@@ -10,13 +10,11 @@ root = true
 [*]
 charset = utf-8
 end_of_line = lf
+indent_size = 4
 indent_style = space
 insert_final_newline = true
 max_line_length = 100
 trim_trailing_whitespace = true
 
-[*.{css,json,md}]
-indent_size = 4
-
-[*.{yaml,yml}]
+[*.{nix,yaml,yml}]
 indent_size = 2