docs: Update GitLab depleyment in /themes/installing.md

Deployment to Gitlab fails if the theme folder is a git submodule.
gohugoio · Dec 28, 2016 · 211d20a · 211d20a
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diff --git a/docs/content/themes/installing.md b/docs/content/themes/installing.md
@@ -28,6 +28,7 @@ Otherwise you will not be able to clone the theme repositories.
 ```bash
 $ git clone --depth 1 --recursive https://github.com/spf13/hugoThemes.git themes
 ```
+Before you use a theme, remove the .git folder in that theme's root folder. Otherwise, this will cause problem if you deploy using Git.
 
 ## Installing a specific theme