Create a separate page in the documentation describing all the limits in Tact

[i582]

Right now, different limits are described on different pages:

We want to have one single page that can be easily sent to the user if they have any questions.

This page may also contain links to examples that demonstrate these limitations (#586)

[novusnota]

Related to #1097

[novusnota]

Configuration params of TON impose all of the limits. From there: exit code 50, gas-related functions (including accept()) and other things get their limits.

From there, maps get their limits too, although indirectly — we need to calculate them as per #586.

Plus things like limits for global variables (ton-community/ton-docs#757), although we don't support those directly. Also, c7 is a tuple, and technically there could be a lot more than just 31 global variables stored there — that's why there's a SETGLOBVAR instruction that can store using indexes from 0 up to 254 inclusive.