Remove (g)vimrc files, update README, Makefile

Signed-off-by: Vivek Rai <vivekraiiitkgp@gmail.com>
Added i3 config

Signed-off-by: Vivek Rai <vivekraiiitkgp@gmail.com>
Add i3exit, change config

Signed-off-by: Vivek Rai <vivekraiiitkgp@gmail.com>