build: create additional Make targets

Create convenience targets to install and reinstall the application where the latter removes the systemd unit files before pulling the latest changes by running bat reset if the application already exists.

The former should pull the changes i.e., git pull --rebase, build the application, and install it to /usr/local/bin.

See the following discussion for details : https://github.com/tshakalekholoane/bat/discussions/73#discussioncomment-7200390.