* Add apple touch icons

* Improve browser configuration icons

This commit adds the backend pieces needed to attach CSV and XLS files
of query results to Pulses. Attachment support is also there for
Alerts. This is an opt-in feature for pulses and alerts. Users can
update existing Pulses to include attachments or add them to a new
pulse. The file(s) will only be attached when there are results.

Fixes #6587, fixes #3894, fixes #2623

This commit has the UI for users to add alerts to a question. Admins
are able to setup alerts for questions and modify alerts that users
have setup.

* MetaStore integration

* Fix lint error

* restructure embedding levels

* Rename updateSetting in setting widgets to onChange, add onChangeSetting

* embed flow images / spacing

* lint fix

* add image files and get new text in there

* modal content + refactor

* update illustrations and remove redundant one

* add tests

* add images

* button text tweaks

* padding