Update Makefile to provide additional options

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

Makefile

@@ -1,26 +1,54 @@
-all:
+usage:
 	@echo ""
 	@echo "usage:"
 	@echo ""
-	@echo "* make dotfiles -- to install dotfiles"
-	@echo "* make clean    -- to clean up dotfiles"
-	@echo "* make update   -- get latest version from github, install manually"
+	@echo "* make install    -- to install dotfiles"
+	@echo "* make reinstall  -- to reinstall & prune obsolete symlinks"
+	@echo "* make delete     -- to delete dotfiles"
+	@echo "* make update     -- get latest version from gitlab"
 	@echo ""
 
-linux:
+install:
 	mkdir -p ~/.config
 
-	stow gitconfig
+	stow git
 	stow gnupg
 	stow imapfilter
-	stow mbsyncrc
-	stow msmtprc
+	stow mbsync
+	stow msmtp
 	stow mutt
-	stow notmuch-config
+	stow notmuch
 	stow nvim
 	stow tmux
 
-update:
-	git pull --verbose
+reinstall:
 
-.PHONY : all dotfiles clean
+	stow -R git
+	stow -R gnupg
+	stow -R imapfilter
+	stow -R mbsync
+	stow -R msmtp
+	stow -R mutt
+	stow -R notmuch
+	stow -R nvim
+	stow -R tmux
+
+delete:
+
+	stow -D git
+	stow -D gnupg
+	stow -D imapfilter
+	stow -D mbsync
+	stow -D msmtp
+	stow -D mutt
+	stow -D notmuch
+	stow -D nvim
+	stow -D tmux
+
+update:
+
+	git pull --verbose
+	git submodule update --init --recursive
+
+all:
+	usage