favicon: Add dark mode support

Closes #2538

Works as expected on latest Firefox and Chromium.

It requires git-lfs to pull down if you want to adjust the favicon and
also the affinity designer software available only on Windows and Mac.

Might be a good idea to switch to Figma at some point and commit a
.fig file.

docs: add details to updating vscode section

This can happen if you `yarn release` without keeping node modules.

v3.8.0

🎅🏼

Fix GitHub auth

Symlink node_modules.asar to node_modules in lib/vscode

Update ipad.md

proxy-agent: Use proxy-from-env and add docs

ci: Add support for FreeBSD to the build process

Cases in URLs like ?&a=b or ?a=b& appear to be handled just fine.

Capital letters in the CLI are evil.

cc @code-asher

Co-authored-by: NAnmol Sethi <hi@nhooyr.io>

Updates #2349

Electron doesn't support FreeBSD.

Now that we've moved to the submodule, there is no need to reset changes
in there :)

cc @jsjoeio

We don't have an agent for FreeBSD right now.

Now we support pretty much every variable under the sun along with
$NO_PROXY all correctly and with minimal code on our end.

Just convention, see https://golang.org/pkg/net/http/#ProxyFromEnvironment