Replace 'Apply now' Button on Academy Page

Description of Changes Made

Removes the button for applying to the academy scheme, as applications for this have now closed. To reopen applications, add a new link to the academy day in Contentful. To close applications, remove the application link. I've added a note for how this works in the Contentful editor.

I decided to style a div for this instead of creating of passing another prop to the Button component: the button component already has several different style modifications applied to it.

How to Test

This page should show applications closed on the preview site as I've removed the application link.

Link to changes made on preview site

Screenshots

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MR Checklist

[x] Add a description of your pull request and instructions for the reviewer to verify your work.
[x] If your pull request is for a specific ticket, link to it in the description.
[x] Stay on point and keep it small so the merge request can be easily reviewed.
[x] Consider adding unit tests, especially for bug fixes. If you don't, tell us why.
[x] Tests and linting passes.
[x] Consider updating documentation. If you don't, tell us why.
[x] If relevant, list the environments / browsers in which you tested your changes.

torchbox / careers