This PR makes the `border` methods require an explicit width instead of
defaulting to 1px.
This breaks convention with Tailwind, but it makes GPUI more consistent
with itself. We already have an edge case where the parameterized method
had to be named `border_width`, since `border` was taken up by an alias
for the 1px variant.
### Before
```rs
div()
.border()
.border_t()
.border_r()
.border_b()
.border_l()
.border_width(px(7.))
```
### After
```rs
div()
.border_1()
.border_t_1()
.border_r_1()
.border_b_1()
.border_l_1()
.border(px(7.))
```
Release Notes:
- N/A
This PR deletes the old `ui` and `storybook` crates in favor of their
newer variants that we'll be landing to `main` in the near future.
### Motivation
These crates are based off the old version of GPUI 2 (the `gpui2`
crate).
At this point we have since transitioned to the new version of GPUI 2
(the `gpui3` crate, currently still on the `gpui2` branch).
Having both copies around is confusing, so the old ones are going the
way of the dinosaurs.
Release Notes:
- N/A
Marshall Bowers