Generating symbolic link for the theme itself

[felipenmoura]

This is a "proof of concept". I don't really expect it to be merged, but wanted to offer an insight so you could test it and validate its importance. Then, let's think together how we can make it work in a best way. You can check the diffs here to understand the idea.

Now, you can clone the project straight into your /wp-content/themes.
Once you build it, it will create a symbolic link to the theme directory in your project in the parent's directory. With this, users will be able to see the PWAWP-theme as one of the themes in their WP admin.

The interesting thing here is that now, we can run npm run watch once, and as we save files in our theme, the changes will be applied to our local wordpress page (no need to copy the theme into wp-content dir again and again).

For the deploy, we should copy the dist diretory and the symbolic link. I believe we can make it better, though.

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