[users] Tables in Gemtext

[A. E. Spencer-Reed]

It looks like no one has mentioned box-drawing characters yet, they
look good, are supported as part of UTF-8, and I suspect they'd be
easy to parse.
```
┌──────┬───────┐
│ Text │ goes  │
├──────┼───────┤
│ in   │ these │
└──────┴───────┘
```
There are other styles that would need to be accounted for, like
```
┏━━━━━━┓
┃ Bold ┃
┗━━━━━━┛
```
or
```
╔════════╗
║ Double ║
╚════════╝
```
borders.

=> https://en.wikipedia.org/wiki/Box-drawing_character#Unicode More
information about box drawing characters