feat: Custom accent color (#4897)

* types

* Working, but messy

* Add InputColor component

* types

* Show default theme values when not customized

* Support custom theme on team sign-in page

* Payload validation

* Custom theme on shared documents

* Improve theme validation

* Team -> Workspace in settings

app/components/Sidebar/components/EditableTitle.tsx

@@ -123,7 +123,7 @@ const Input = styled.input`
   height: 32px;
 
   &:focus {
-    outline-color: ${(props) => props.theme.primary};
+    outline-color: ${(props) => props.theme.accent};
   }
 `;