Proposal: Tact Cookbook should become a part of docs

[novusnota]

It would be nice to have Tact Cookbook become a part of Tact documentation, just like FunC Cookbook is a part of TON Docs. The original repo may get archived afterwards, but not deleted, as many people made their valuable contributions to it during Hack-TON-berfest and those efforts should be preserved and cherished.

Pros:

1. All the syntax would be now highlighted.
2. All the links would be checked once Add link checking to CI (and git hooks) #65 gets implemented.

Cons: none?

[anton-trunov]

I think this would be nice! All those nice contributions would be more visible then. @alefmanvladimir what do you think?