Add link between GSoC 2025 ideas page and classics page

[divine7022]

Changes

• Added a cross-reference link between the "Google Summer of Code (GSoC) 2025 ideas page" and the "Google Summer of Code (GSoC) 2025 ideas page - classics".
• Improved navigation and clarity for users by making it easier to switch between the two pages.

Why This Change is Needed

The two pages are related but currently lack a clear link between them, which can cause confusion for users. This change ensures that users can easily navigate between the main ideas page and the classics page.

Testing

• Verified that the links work correctly by testing locally with hugo serve.
• Ensured that the changes do not break any existing content or formatting.

[divine7022]

@Akshatji800 Hey Akshat Tripathi Sir, I have made the requested changes in this PR. Could you please review it and let me know if any further modifications are needed? Thanks! 😊

[divine7022]

These are the supporting images which shows the changes made.

[canihavesomecoffee]

If you can rebase (and merge conflicts) we can have a look at this again :)

[techno-disaster]

If you can rebase (and merge conflicts) we can have a look at this again :)

ping @divine7022

[divine7022]

If you can rebase (and merge conflicts) we can have a look at this again :)

ping @divine7022

@techno-disaster Fixed the merge conflict, let me know if there are further modifications are needed.
Thank you!

[canihavesomecoffee]

That was a merge, not a rebase ;)