5078 ability to invite team members (#5750)

## Added features
- update team member setting page
- add a section to send invitation by email
- add a new invitation email
- update email font to 'Trebuchet MS' as Google Inter font is not
working, we need to use a web safe font
https://templates.mailchimp.com/design/typography/

## Demo

https://github.com/twentyhq/twenty/assets/29927851/c731d883-1599-4281-87e3-0671f36994ae

## Invitation Email

![image](https://github.com/twentyhq/twenty/assets/29927851/d569fc64-fa0c-4769-a3dd-1193a12b495c)

packages/twenty-emails/src/utils/capitalize.ts

@@ -0,0 +1,7 @@
+import { isNonEmptyString } from '@sniptt/guards';
+
+export const capitalize = (stringToCapitalize: string) => {
+  if (!isNonEmptyString(stringToCapitalize)) return '';
+
+  return stringToCapitalize[0].toUpperCase() + stringToCapitalize.slice(1);
+};