Update for GNOME 45

Author: slaclau

.editorconfig

@@ -0,0 +1,12 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+charset = utf-8
+trim_trailing_whitespace = true
+end_of_line = lf
+insert_final_newline = true
+
+[*.js]
+quote_type = single

.prettierrc

@@ -0,0 +1,8 @@
+tabWidth: 4
+useTabs: false
+semi: true
+singleQuote: true
+quoteProps: 'as-needed'
+trailingComma: 'es5'
+bracketSpacing: false
+arrowParens: 'avoid'