UI/UX/styling fixes

[freemvmt]

Some parts of the site could do with being tidied up/aligned/otherwise adjusted, including:

mobile

• [x] Footer sitting on top of buttons on Home page (for v small phones e.g. iPhone 5) - RH
• [x] Some question containers expand beyond edges of page, especially when text fields are present (and including when Other text field appears) - RH
• [x] Hard to highlight and copy full user ref - RH
• [x] Support service cards overflow page - RH

desktop

• [x] Spacing between text/buttons on Splitter page is too big
• [x] Spacing between different types of text too big on divider pages

both

• [x] 'Back to top' link doesn't work on FAQ page (bug)
• [x] Email field has weird outline on top when selected - RH
• [x] FAQ page not very navigable (cf. #154)
• [x] FAQ navigation links don't look nice/consistent - RH
• [x] 'Back to top' button on FAQ has funny colouring due to using a tag to achieve internal anchor link
• [x] No Loading icon after entering form, during 1-2s delay (cf. #155)
• [x] Make it easier to copy UUID (e.g. by having a 'copy' button)
• [x] Add a bit more space (a few pixels) between 'MU' and 'Safe Space' in logo - RH