Define indent size in editorconfig (#550)

GeckoEidechse · web-flow · commit b269c4df616b · 2023-10-04T13:57:34.000+02:00
Setting indent size in `.editorconfig` means that things like GitHub web
preview will default to showing tab indent size as 4 spaces.
diff --git a/.editorconfig b/.editorconfig
@@ -9,3 +9,4 @@ charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
 indent_style = tab
+indent_size = 4
