feat: invites (#967)

* stub invite endpoint

* feat: First pass invite UI

* feat: allow removing invite rows

* First pass: sending logic

* fix: label accessibility

* fix: add button submits
incorrect permissions
middleware flow error

* 💚

* Error handling, email filtering, tests

* Flow

* Add Invite to people page
Remove old Tip

* Add copy link to subdomain

app/components/Button.js

@@ -114,7 +114,7 @@ export default function Button({
   const hasIcon = icon !== undefined;
 
   return (
-    <RealButton small={small} {...rest}>
+    <RealButton small={small} type={type} {...rest}>
       <Inner hasIcon={hasIcon} small={small} disclosure={disclosure}>
         {hasIcon && icon}
         {hasText && <Label hasIcon={hasIcon}>{children || value}</Label>}