[FIX] web_editor: remove prettier configuration

Odoo Editor had a custom prettier configuration when it was a separate
repository. We don't need it anymore.

Part-of: odoo/odoo#94516

addons/web_editor/static/src/js/editor/odoo-editor/_prettierignore

@@ -1 +0,0 @@
-test/lib

addons/web_editor/static/src/js/editor/odoo-editor/_prettierrc.js

@@ -1,11 +0,0 @@
-module.exports = {
-    semi: true,
-    trailingComma: 'all',
-    singleQuote: true,
-    printWidth: 100,
-    tabWidth: 4,
-    bracketSpacing: true,
-    arrowParens: 'avoid',
-    quoteProps: 'preserve',
-    endOfLine: 'lf',
-};