[Bug] Remove Unused Commented Code to Improve Readability

## Description
The current 404.html code for the CC Search Portal contains commented-out sections. Keeping unused code can make the file cluttered.This can make it harder for future developers to read and maintain it.The best practice would be to remove unnecessary code to improve its clarity and maintainability.
## Reproduction

1. Navigate towards the 404.html page in the src folder
2. Locate the commented code

## Expectation
Removing unused commented code will lead to a cleaner codebase and this will improve maintainability and reduce confusion for future contributors.

## Screenshot

## Environment

- Device: (_eg._ iPhone Xs; laptop)
- OS: (_eg._ iOS 13.5; Fedora 32)
- Browser: (_eg._ Safari; Firefox)
- Version: (_eg._ 13; 73)
- Other info: (_eg._ display resolution, ease-of-access settings)

## Additional context
If the commented code is intended for use in the future then it can be documented more clearly .
## Resolution

- [x] I would be interested in resolving this bug.

Open src/404.html and inspect the commented-out sections identified in the issue and screenshots. Confirm which comments are unused, remove only that code, and check that the 404 page remains intact and readable afterward.

Written by the indexing model from the issue text.