Added appointment reminder email + gql fragments for emails.

client/src/components/email-overlay/email-overlay.component.jsx

@@ -13,19 +13,19 @@ export default function EmailOverlayComponent({
       <Input
         defaultValue={messageOptions.to}
         onChange={handleConfigChange}
-        name='to'
+        name="to"
       />
       CC
       <Input
         defaultValue={messageOptions.cc}
         onChange={handleConfigChange}
-        name='cc'
+        name="cc"
       />
       Subject
       <Input
         defaultValue={messageOptions.subject}
         onChange={handleConfigChange}
-        name='subject'
+        name="subject"
       />
       <CKEditor
         editor={ClassicEditor}