feat: add cta on complete page (#1028)

![CleanShot 2024-03-18 at 11 45
40](https://github.com/documenso/documenso/assets/25515812/ae3b88de-359d-4019-866a-a76097bbb0fe)
![CleanShot 2024-03-18 at 11 46
25](https://github.com/documenso/documenso/assets/25515812/b5ff7078-623e-476c-8800-17d14bc8efa9)


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Introduced a "Claim Account" feature allowing new users to sign up by
providing their name, email, and password.
- Enhanced user experience for both logged-in and non-logged-in users
with improved UI/UX and additional functionality.

- **Enhancements**
- Implemented form validation and error handling for a smoother sign-up
process.
	- Integrated analytics to track user actions during account claiming.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: Lucas Smith <me@lucasjamessmith.me>
Co-authored-by: David Nguyen <davidngu28@gmail.com>

packages/trpc/server/auth-router/router.ts

@@ -56,7 +56,7 @@ export const authRouter = router({
 
       return user;
     } catch (err) {
-      console.log(err);
+      console.error(err);
 
       const error = AppError.parseError(err);
 

packages/trpc/server/auth-router/schema.ts

@@ -23,7 +23,7 @@ export const ZSignUpMutationSchema = z.object({
   name: z.string().min(1),
   email: z.string().email(),
   password: ZPasswordSchema,
-  signature: z.string().min(1, { message: 'A signature is required.' }),
+  signature: z.string().nullish(),
   url: z
     .string()
     .trim()