Linux install instructions provide code signing key, but no acutal signature for the .deb package

https://keybase.io/docs/the_app/install_linux

The documentation mentions "If you want our code signing key, you can get it here and verify it here." But the rest of the instructions only give a way to get the .deb and install it without prior verification. I would expect to be able to verify the package before running any `sudo` commands. Going to the download page https://s3.amazonaws.com/prerelease.keybase.io/linux_binaries/deb/index.html doesn't provide any signatures either.

Start with the Linux installation instructions at keybase.io/docs/the_app/install_linux and the package listing at s3.amazonaws.com/prerelease.keybase.io/linux_binaries/deb/index.html. Determine how a downloaded .deb can be verified with the published code-signing key before any sudo command; done means the signature is available and the instructions describe that pre-install verification.

Written by the indexing model from the issue text.