⚡️ Completely overhauled exit codes page in the documentation

Sometimes pages in the Tact documentation are more detailed than you'll find elsewhere. The exit codes page is a case in point.

Not only do you get a comprehensive description of what exit codes are, how they are defined, and which ones are reserved, but you also get a handy table of them with short descriptions and quick navigation to each exit code in the table of contents. Since each of the exit codes has its own headings, linking to a specific exit code is easier than ever!

In addition, all descriptions of compute phase exit codes show examples of how you might encounter them. And sometimes even help you to anticipate and avoid them.

By the way, for exit code 50 (not listed anywhere else), we've also described the current limits on config param 43 related to account state, max number of bits and cells in messages, and much more.

🧑‍🍳 Contributor: Novus Nota
🐙 Implementation: #978
✈️ Delivered: docs.tact-lang.org/book/exit-codes

🍲 code: dismissed
♨️ @tact_kitchen