Pin rubocop to a sane version. 

- upgrading to 0.27.1 raised some dubious errors.
A helper method to enable html page titles
Accessible page titles for error pages
Accessible page titles for profile pages
Accessible page titles for team pages
Accessible page title for search results page
Accessible page titles for login pages
Make heading levels sequential on login pages

- accessible pages need h1 h2 h3 to be sequential

- uses a fake '.h3' class to display an h2 as an 
h3
Add role='alert' to the login error message
Use h1 on token created page
Disable link from logo on home page

- requires moj_internal_template bump
Re-style breadcrumbs with nav and ol elements
Use h2 tags for subheadings on profile edit page
Wrap working days in a descriptive legend

- a visually hidden legend should help users
understand the intention of the working days 
checkboxes on the edit profile page
File upload button has a visually hidden label
Improve alt text for a profile image

- should read "Current photo of PERSON"
Add role='alert' to all flash messages
Improve warning text on delete profile dialog box
Improve accessibility of working days on profile

- hide the day letter (e.g. 'M') from screen readers

- add visually hidden text (e.g. 'Works Monday')
Add visually hidden label and button for the search box