remove installing a concrete plugin/theme from main cli of omf

plugins/omf/omf.fish

@@ -8,11 +8,7 @@ function omf -d "Oh My Fish helper"
   if test (count $argv) -gt 0
     switch $argv[1]
       case 'install'
-        if test (count $argv) -gt 2
-          omf.packages --install $argv[2] $argv[3]
-        else
-          omf.packages --install
-        end
+        omf.packages --install
       case 'update'
         omf.packages --update
       case 'list' 'ls'

plugins/omf/omf.helper.fish

@@ -10,11 +10,9 @@ function omf.helper -d 'Prints all functions supported by Oh My Fish helper'
   omf.log normal ''
   omf.log normal '  Examples:'
   omf.log normal '    omf install'
-  omf.log normal '    omf install --plugin|--theme NAME'
   omf.log normal '    omf update'
   omf.log normal '    omf list'
   omf.log normal '    omf self-update'
   omf.log normal '    omf plugins'
   omf.log normal '    omf themes'
 end
-