Some resources to use when creating pages:
community.failbettergames.com- The Fallen London and Sunless Sea forums. The subforums for both games have lore sections that are absolutely worth the read.
fallenlondon.wikia.com- The semi-official Fallen London wiki. Has some lore, but you'll have to look through the pages for many of the options in each storylet to find juicy lore.
sunlesssea.gamepedia.com- The semi-official Sunless Sea wiki. Useful for location information, art, and occasionally things like the Neathbow.
echobazaar.wikidot.com- Outdated Fallen London wiki. Has a bit of character/location info.
britetimes.tumblr.com- NiteBrite's FL/SS tumblr. She's done some amazing stuff - beaten Mr. Iron at Knife and Candle, for example. She also has some great lore info.
saint-arthur.tumblr.com- Spacemarine9's Fallen London Q&A tumblr. Very, very good and addictive lore source. Over 500 pages of posts. A lot of the early content is about Seeking Mr. Eaten's Name - quite useful if you're wondering what that was like.
fllorearchive.tumblr.com - Saint-Arthur's lore-related posts up until this past June, with tags. Much easier to read through because there's no gameplay stuff to skip over.
saint-beau.tumblr.com- Spacemarine9's Sunless Sea Q&A tumblr. Also a very good and addictive lore source, but it's newer and smaller - only about 50 pages of posts.
Let me know if there are any more I should add!