[OTHER] Update Discord links

[Panquesito7]

What would you like to share?

We're using a new link for The Algorithms' Discord invitation.
All Discord invitation links should point to https://the-algorithms.com/discord/.

Additional information

This is a good first issue. Please leave it open to first-time contributors and beginners. 🙂

[kunjgit]

I have checked all the discord link is already pointing to this link only please can you clear me what is the issue??

[Panquesito7]

https://github.com/TheAlgorithms/C-Plus-Plus/search?q=c7MnfGFGa6
There are still a few instances that need to be updated.

[streetstylecoder]

hi,I'm working on this issue!!