fix a whole mess of typos

[mefuller]

Fixed various typos, both seen and unseen by website viewers (latter fixes improve search and maintenability of source code)

[thetwopct]

Thanks for the PR @mefuller!

• We will keep the use of folx
• The img-with-aniamtion-wrap class in the Annual Report 2019 was from a scraped version of the original 2019 report, and turned out to be an unused class, so easier to just remove than fix.
• I've updated the couple of other spelling mistakes, thanks for the spot!

As that covers everything in this PR, will close.