Configure editors to explicitly use LF / \n line endings (#10916)

.editorconfig

@@ -1,12 +1,14 @@
 root = true
 
-[*.{py,pyi,rst,md,yml,yaml,toml,json,txt}]
+[*]
 trim_trailing_whitespace = true
 insert_final_newline = true
 indent_style = space
+end_of_line = lf
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false
 
 [*.{py,pyi,toml,json}]
 indent_size = 4
-
-[*.{yml,yaml}]
-indent_size = 2