Drupal 8.x

After installing fontawesome module on drupal 8 site, I tried the following:

    public function buildForm(array $form, FormStateInterface $form_state) {
      $form['street1']['widget']['#prefix'] =
          '<span class="input-group-addon"><i class="fa fa-envelope-o fa-fw"></i></span>';
    }

The "envelope" icon shows up quite alright -but its showing above my "Street Address" label, instead of inline before the actual input textfield.

Viewing source of my page shows the following:

I have done some D7 subtheming, but D8 is not recognizing the subtheme.

Bootstrap theme is installed.

Subtheme directory named:

fate_bootstrap_subtheme

yaml file is named:

fate_bootstrap_subtheme.info.yaml

The starting code in the yaml file is as follows:

I have some little javascript apps (stand alone pages) - calculators and such - i want to make available at my site but I want them to open in separate windows so you can move around the site without losing your work in them. I don't want an overlay and that's all I seem to find info about. Any ideas? Thanks.

I've got drupal8 working locally, using AcquiaDevDesktop2, and I am attempting to import the root of my custom site into the 'sites' directory. What is the proper way of importing that site into my drupal project? There will be a main menu link with a custom url to "http://drupal/sites/testsite/index.php".

Looking for some advice/examples of how to create a custom table that uses an ajax pager.