Allows me to test notifications

An user complained in zed-industries/community#2093 that we always link
to the latest release changelog, not the one that they've just updated
to.


Release Notes:
- Fixed changelog link in update notification always leading to the
latest release changelog, not the one that was updated to. Fixes
zed-industries/community#2093.

This PR adds an option to run `activate.nu` in the automatic venv
activation code (relevant comment
[here](https://github.com/zed-industries/community/issues/2103#issuecomment-1742355651))

Release Notes:

- Added a `nushell` option to the
`terminal.detect_venv.on.activate_script` setting
([2103](https://github.com/zed-industries/community/issues/2103)).

Co-Authored-By: Max Brunsfeld <max@zed.dev>

Co-Authored-By: Max Brunsfeld <max@zed.dev>

The goal of this PR is to make Following more intuitive.

### Old Behavior

Previously, following was scoped to a project. In order to follow
someone in a given window, the window needed to contain a shared
project, and the leader needed to be present in the project. Otherwise,
following failed.

### New Behavior

* You can always follow **any** participant in the current call, in any
pane of any window.
* When following someone in a project that you're both collaborating in,
it works the same as before.
* When following someone in an unshared project, or a project that they
don't have open, you'll only get updates about the leader's views that
don't belong to a project, such as channel notes views. When the leader
focuses a file in a different project, you'll get the "follow $LEADER to
their active project" indicator

### Todo

* [x] Change db schema and RPC protocol so a project id isn't required
for following
* [x] Change client to allow following into non-project items regardless
of the leader's project
* [x] Assign colors to users in a way that doesn't require users to be
in a shared project.

This PR is a bit of a last minute change, but I realized there was
actually a third player in the Elixir LSP space who wants support as
well,
[lexical](https://github.com/zed-industries/community/issues/1567). I
realized that the settings arrangement I shipped in this preview
precludes adding a third kind of LSP. I don't have the time to learn how
to fully support this LSP, but I thought I'd at least refactor how the
settings are represented before this hits stable.

Release Notes:

- Changed the new `"elixir": { "next": "on" }` setting to `"elixir": {
"lsp": "next_ls" }`. The `elixir.lsp` setting requires a full restart to
take effect. (Preview only)

This makes zed always behave as if the app is active, even if no window is focused.
It prevents the 'viewing a window outside of zed' state during collaboration.

Release Notes:

- vim: Fix a bug where following could put you in visual mode

fixes https://github.com/zed-industries/community/issues/2098

Release Notes:

- Fixed a bug in Zed's LSP implementation when using Next LS.

add scheme as a parseable file type in semantic index.
Each file will operate as a single embedding, in which no real scheme
syntax or tree-sitter level data is stored.

Release Notes:

- Added scheme to Semantic Index

This PR fixes the glyph used for the option key in the new `Keybinding`
component.

Same fix as in #3065, but applied to the new `Keybinding` component so
that we don't regress when switching to GPUI2.

<img width="750" alt="Screenshot 2023-09-29 at 10 50 15 AM"
src="https://github.com/zed-industries/zed/assets/1486634/8c6147e9-fa05-4804-954c-b8e3b98cbdf0">

Release Notes:

- N/A

![image](https://github.com/zed-industries/zed/assets/24362066/94731737-a21a-4cef-a445-eb855f1a4d3e)

![image](https://github.com/zed-industries/zed/assets/24362066/e879ec9a-70aa-4989-923f-4cca18d01587)

Release Notes:

- Fixed option key's appearance in keybindings

![CleanShot 2023-09-27 at 18 09
37](https://github.com/zed-industries/zed/assets/482957/317d31e4-81f8-44d8-b94f-8ca7150d3fd2)

Release Notes:

- Added the ability to exclude warnings from project diagnostics. By
default, they will be on but they can be disabled temporarily by
clicking on the warnings icon. The default behavior can be changed by
changing the new `diagnostics.include_warnings` setting.

This PR fixes the kitchen sink story in the storybook.

Included are some additional changes that make it so the kitchen sink is
automatically populated by all of the defined stories.

Release Notes:

- N/A

This PR mainlines the current state of new GPUI2-based UI from the
`gpui2-ui` branch.

Release Notes:

- N/A

---------

Co-authored-by: Nate Butler <iamnbutler@gmail.com>
Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>
Co-authored-by: Marshall Bowers <1486634+maxdeviant@users.noreply.github.com>
Co-authored-by: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>
Co-authored-by: Nate <nate@zed.dev>
Co-authored-by: Mikayla <mikayla@zed.dev>

Release Notes:

- vim: Fix `dw` on the last word of a line, and on empty lines.

Release Notes:

- vim: Add ctrl-i to go forward
([#1732](https://github.com/zed-industries/community/issues/1732)).
ctrl-o was already supported.
- vim: Add `g <space>` to open the current snippet in its own file.
- vim: Escape will now return to normal mode even if completion menus
are open (use `ctrl-x ctrl-z` to hide menus, as in vim).
- vim: Add key bindings for Zed's various completion mechanisms:
- - `ctrl-x ctrl-o` to open the completion menu,
- -  `ctrl-x ctrl-l` to open the LSP action menu,
- - `ctrl-x ctrl-c` to trigger Copilot (requires configuring copilot),
- - `ctrl-x ctrl-a` to trigger the inline Assistant (requires
configuring openAI),

NOTE: we should add these to the docs before shipping 0.107 to stable.