Various Text Changes

- [x] Your fee page - remission help text
- [x] Sign out page - h2 copy change
- [x] Start your claim page - how we use your information text show/hide updated
- [x] Start your claim page - Learn about Acas link
- [x] Start your claim page - removed link text 'when can I apply' 
- [x] Start your claim page - There is a fee text + link
- [x] Claim details - what else do I need to include, link to guide
- [x] Claim details - Help text for character limit
- [x] Respondent page - added Acas link to help text
- [x] Moved text for start your claim page from slim file to yml file