Remove unused modules

.gitmodules

@@ -22,9 +22,6 @@
 [submodule "org-pomodoro"]
 	path = org-pomodoro
 	url = https://github.com/lolownia/org-pomodoro.git
-[submodule "alert"]
-	path = alert
-	url = https://github.com/jwiegley/alert.git
 [submodule "fringe-current-line"]
 	path = fringe-current-line
 	url = https://github.com/kyanagi/fringe-current-line.git
@@ -61,9 +58,6 @@
 [submodule "qml-mode"]
 	path = qml-mode
 	url = https://github.com/coldnew/qml-mode
-[submodule "linum-relative"]
-	path = linum-relative
-	url = https://github.com/coldnew/linum-relative
 [submodule "emacs-color-theme-solarized"]
 	path = emacs-color-theme-solarized
 	url = git@github.com:wilderjds/emacs-color-theme-solarized.git
@@ -88,9 +82,6 @@
 [submodule "flyspell-lazy"]
 	path = flyspell-lazy
 	url = https://github.com/rolandwalker/flyspell-lazy
-[submodule "emacs-libvterm"]
-	path = emacs-libvterm
-	url = https://github.com/akermu/emacs-libvterm.git
 [submodule "biblio.el"]
 	path = biblio.el
 	url = https://github.com/cpitclaudel/biblio.el

alert

@@ -1 +0,0 @@
-Subproject commit 7046393272686c7a1a9b3e7f7b1d825d2e5250a6

emacs-libvterm

@@ -1 +0,0 @@
-Subproject commit f41849c2c9c1899f22d1c3d4f871ec47c82627ce

linum-relative

@@ -1 +0,0 @@
-Subproject commit c74a6981b688a5e1e6b8e0809363963ff558ce4d