[Anna-Sutton]

• Amended existing vax history error page to remove 'Continue anyway' button. Discussed with devs and decided if no history at all can be fetched from the APIs, we'd allow the user 1 go at calling the APIs again with a 'Try again button'.
• Added extra error page with 'Continue anyway' button for when no vax history could be retrieved after the user has had their 1 go to try again (see scenario above).
• Updated the PDS API error for when user has tried again and now only has option to continue, to reflect wording that is being developed.
• Updated prototype index page to add the new error page and reflect the other changes.