Add temporary ability to verify resources

[vontell]

In order to have a successful v2 launch of PHLask, we need to make sure that resources on the platform are verified. Currently, each resource in our database has a verified field, which is set to false by default.

We would like a way to easily mark resources as verified. Rather than building out a dashboard for admins (which we will do eventually), we will implement a feature within the app that allows us to mark a resource as verified or as not valid (and therefore deleted). The idea is that team members can go check various resources in person (or in streetview) and easily mark the resource as verified.

The below screenshots show a proposed design / flow for how this would work. Here are the main ideas:

• A tag showing "VERIFIED" or "UNVERIFIED" is added to the detailed view of a resource. In the images below, I found that the bottom right of the image header of the resource is a good spot.
• When that tag is clicked, a dialog pops up. An admin can enter a password (which we will provide to PHLask members) and then choose whether this should be marked as verified or deleted.
• Based on what the user chooses, a call to firebase is made - either to delete that resource, or update its verified field to true.

Note that this feature may be removed soon after the launch, as we build out more official verification tools.

[vontell]

This is implemented in #458