message: Fix INSTALL.md .deb instruction link
diff: @@ -65,7 +65,7 @@ drivers installed too (these are called `libegl1-mesa-dev` on Ubuntu).
  #### Debian/Ubuntu
  You can build alacritty using `cargo deb` and use your system's package manager
  -to maintain the application using the instructions [above](#debianubuntu).
  +to maintain the application using the instructions [below](#debianubuntu-1).
  If you'd still like to build a local version manually, you need a few extra
  libraries to build Alacritty. Here's an apt command that should install all of
  