This commit modifies the HTML `<title>` tags for all the pages. It makes two
main changes:
- make the title tag match the `<h1>` of the page, for better or worse
- put the service name after the page title, seperated by an en dash, as per
GOV.UK
Submit form was
- a confusing name in itself
- not descriptive, because it also has an optional ‘back’ link
This commit also puts this component in as many pages as possible, stripping
out any hard-coded buttons and links.
It replaces any usage of buttons for ‘back’, because these are links, not
buttons (ie they don’t change any data).
