installer: remove package

This is the last of the old installer code. It's no longer used and can
be removed.

.gitignore

@@ -16,46 +16,3 @@ bin_test/
 matchbox/
 /contrib/govcloud/vpn.conf
 tectonic-dev
-
-# non-default Bazel stuff
-.build/
-.cache
-
-# Created by https://www.gitignore.io/api/go,bazel,terraform
-# HOWEVER, I had to remove the ignore for `vendor/`
-
-### Bazel ###
-/bazel-*
-
-### Go ###
-# Binaries for programs and plugins
-*.exe
-*.exe~
-*.dll
-*.so
-*.dylib
-
-# Test binary, build with `go test -c`
-*.test
-
-# Output of the go coverage tool, specifically when used with LiteIDE
-*.out
-
-### Terraform ###
-# Local .terraform directories
-**/.terraform/*
-
-# .tfstate files
-*.tfstate
-*.tfstate.*
-
-# Crash log files
-crash.log
-
-# Ignore any .tfvars files that are generated automatically for each Terraform run. Most
-# .tfvars files are managed as part of configuration and so should be included in
-# version control.
-#
-# example.tfvars
-
-# End of https://www.gitignore.io/api/go,bazel,terraform