added new 404 template with party theme

[Ahasasjain]

I created a new pull request for the 404-party template please review @matteobruni

[sweep-nightly]

Apply Sweep Rules to your PR?

• Apply: All docstrings and comments should be up to date.
• Apply: There should be no instances of commented out code.
• Apply: All error logs should use traceback during exceptions.
• Apply: There should be no instances of import pdb; pdb.set_trace() in production code.
• Apply: There should be no debug log or print statements in production code.
• Apply: All CSS files should be linked using the href attribute.

[sweep-ai]

Apply Sweep Rules to your PR?

• Apply: All docstrings and comments should be up to date.
• Apply: There should be no instances of commented out code.
• Apply: All error logs should use traceback during exceptions.
• Apply: There should be no instances of import pdb; pdb.set_trace() in production code.
• Apply: There should be no debug log or print statements in production code.
• Apply: All CSS files should be linked using the href attribute.

[matteobruni]

Looks good to me