Drop the path to the Suspenders template

Before, [Suspenders][] used an application template to set up Rails
applications. We have since changed the way that Suspenders creates
applications. The template no longer existed, but we still referenced it
in our Rails configuration. People creating Rails applications with that
configuration would get an error. We removed the path to the Suspenders
template because it no longer exists and is no longer needed.

[GitHub](#772)

[suspenders]: https://github.com/thoughtbot/suspenders

Author: purinkle

railsrc

@@ -1,4 +1,3 @@
 --database=postgresql
 --skip-test
 --skip-rubocop
--m=https://raw.githubusercontent.com/thoughtbot/suspenders/main/lib/install/web.rb