update: copyright year in footer

[PaarthAgarwal]

I was exploring the website and found the copyright year 2018-2022 on the documentation page so updating the same in template library pages.

[sanjeevbhusal]

Hey, is anyone assigned for this project?

[sujalkumar29]

Hi, I’d like to work on this issue.
I’ll update the template library footer to match the docs (currently 2018–2025).
If you prefer a different year range or a dynamic year, please let me know.

[bharathlakki]

Hi, I'd like to update to copyright year in the footer as described. I will submit a PR for this. Please let me know if that's okay.

[Nabihamasroor]

I've submitted PR #[462] to update the copyright to 2026 dynamically.