Added hello world example to the gpui crate copied from https://gpui.rs

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- Fixed a panic that could occur finding a git repository.

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This PR cleans up some of the Zed meta docs.

Namely:
- Removed references to the `zed-industries/community` repository
- Removed old docs directory (it'll be in Git history if we need it)

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TEMP

TEMP

First pass of structured errors

Improved error handling for channel joining failures

Sometimes Cocoa calls app delegate methods (notably the display link)
while we're calling Cocoa methods. This causes a deadlock unless we
are careful to run cocao methods while we're not holding our internal
locks

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- Fixed a crash when opening the MacOS Save As dialogue.

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- Fixed a panic in calculating remote cursor positions

Sometimes Cocoa calls app delegate methods (notably the display link)
while we're calling Cocoa methods. This causes a deadlock unless we
are careful to run cocao methods while we're not holding our internal
locks

These are just some small refactorings of our language-server-starting
code, motivated by another change that I decided to bail on:
https://github.com/zed-industries/zed/pull/6448.

This PR updates `Cargo.lock` to reflect the changes made in #6435.

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Typo fix.

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[[PR Description]]

The `color` crate is not actually used by the `zed` crate, despite being
listed as a dependency. This PR removes it.

Previously at UI font size of 20
 - User-less channel: 28 px tall
 - Occupied channel: 30 px tall
 
Now, still at UI font size 20:
 - User-less channel: 30 px tall
 - Occupied channel: 30 px tall

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- Fixed an issue where a channel would grow in height while showing
participant avatars.

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- Added chat mentions for everyone in the call

After the general release we saw a number of crashes due to a SEGFAULT
inside the
System::new() method apparently relating to refreshing the user list.

As we do not need the user list, and the similar code in the telemtry
create is not crashing,
do less work for now.

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- Fixed a crash when opening the feedback modal

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- Fixed: When using the comment shortcut, previously HTML or JS/TS would
all prefix lines with `// `. This PR brings the comments inline with
what is expected (`// ` for JS/TS, `<!-- ... -->` for HTML). Fixes
[#4578](https://github.com/zed-industries/zed/issues/4578).

[[PR Description]]

This replaces the `tempdir` crate with `tempfile`, which resolves
[RUSTSEC-2018-0017](https://rustsec.org/advisories/RUSTSEC-2018-0017).

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This was broken because the panel was created before being added to a
dock. Invert the control order and add `starts_open()` to the Panel
trait (which lets us simplify how this worked for the ProjectPanel too)

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- Improved Chat visibility when joining a call as a guest

Avoids spurious failures when the CI server is going slow

We set up a new CI server recently, and this caused a build to fail

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This was broken because the panel was created before being added to a
dock. Invert the control order and add `starts_open()` to the Panel
trait.

Was running into an issue building live_kit_server after a fresh clone
due to missing dependencies for build.rs. The use of git submodules
wasn't currently documented.

Reverts zed-industries/zed#4236

This causes an infinite loop when opening the language server logs

It looks like bug reports are being moved from
`zed-industries/community` to `zed-industries/zed`. This PR updates the
`feedback` crate to update the GitHub URL to reflect this change.

It looked to me that `registers` was intended to be a link here...if I'm
wrong, feel free to ignore :-)

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