Create pages to view schools data

[peteryates]

We know we're going to need to be able to list, search for and display schools in the admin area. Until we have final designs let's build a basic version we can easily iterate.

Schools should be a top level nav item (in the service nav):

There should be a search field that allows schools to be found by URN or name.

Here's how it looks in ECF1:

Here's an example of what the school view when you click into a school to see the teachers at that school:

Tasks

• [x] add Schools to the service nav in the admin area
• [x] create the necessary routes for listing/viewing schools - use urn for in the route for a particular school (/schools/123456)
• [x] add search capability that works similarly to the teacher search
• [x] add a school view that for now shows the school's URN, name and address
• [x] add functionality that when you click on the school it takes you to a list of ECT and mentor records associated with that school
• [x] add pagination with Pagy and the pagination component - Pagy will probably need some initial config too

Super lowfi mockup

[claire-hughez]

Lorenzo needs to push a few commits to the PR, and now ready for dev review.