Avoid modifying git hooks if created as sub directory in an existing git repo

[bseib]

Version

3.0.0-rc.9

Node and OS info

Node 8.11.3 / npm 6.3.0 / MacOS (and Win7)

Steps to reproduce

// cd into exiting git project
vue create foo
// choose "manually select features"
// deselect all features (actually it doesn't matter what you select)

When the dependencies are installed, Yorkie gets installed, and Git hooks are setup, whether I want them or not.

What is expected?

I don't expect my git hooks to be touched unless I require them and have been informed that they will be changed.

If users select a feature that requires git hooks, they should be told that the hooks will be installed (and perhaps how to uninstall them in the future -- maybe name the hooks more obviously). If the features they select do not require git hooks, then no hooks should be installed.

What is actually happening?

After running vue create foo, if you list the contents of .git/hooks, you will find the 19 new hooks have been installed by Yorkie.

When the foo directory is deleted, the hooks still expect foo directory to exist and give errors when git commands are used.

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Here's a conversation on the forum on this topic: https://forum.vuejs.org/t/vue-cli-3-yorkie-and-git-stash/39828

[yyx990803]

After reading the forum thread I've edited the title to be more specific.