[#23] Convert completion into a module

.gitmodules

@@ -1,5 +1,5 @@
-[submodule "completions"]
-	path = completions
+[submodule "modules/completion/completions"]
+	path = modules/completion/completions
 	url = https://github.com/zsh-users/zsh-completions.git
 [submodule "modules/history-substring-search/external"]
 	path = modules/history-substring-search/external

completions

@@ -1 +0,0 @@
-Subproject commit f6108b8c4250565611a08b164cfdc85e6c76ee88

init.zsh

@@ -26,7 +26,6 @@ zstyle -a ':omz:load' omodule 'omodules'
 fpath=(
   ${0:h}/themes/*(/FN)
   ${omodules:+${0:h}/modules/${^omodules}/{functions,completions}(/FN)}
-  ${0:h}/{functions,completions}(/FN)
   $fpath
 )
 
@@ -52,7 +51,6 @@ source "${0:h}/helper.zsh"
 source "${0:h}/environment.zsh"
 source "${0:h}/terminal.zsh"
 source "${0:h}/editor.zsh"
-source "${0:h}/completion.zsh"
 
 # Source modules defined in ~/.zshrc.
 for omodule in "$omodules[@]"; do