Libraries page improvement

[Andre-LA]

Adding the vector library to the Libraries page (copied from the code comments)

Preview: https://andre-la.github.io/nelua-lang/libraries/

[edubart]

It's interesting to add fields also, like

| vectorT.size: usize | Number of the elements in the vector. |
| vectorT.data: span(T) | Elements storage of the vector. |
| vectorT.allocator | Allocator of the vector. |

[Andre-LA]

should _grow also be added?
Edit: nevermind, just noticed that internal functions are documented on filestream

[edubart]

@Andre-LA Don't add internal functions, I will remove those from the docs, internal functions are implementation details that can change often and should be avoided.

[edubart]

Looks good, once you mark as non draft I will merge.

[Andre-LA]

Done :)
(I did some changes arg's and math's compile-time values descriptions on commit 61c0016)

[edubart]

Thanks, merged!