Add background story for characters

Having a background story to each character gives users an idea of where and when to use them.

For example, Ringo looks like a "corporate" character. If he is a busy manager, with a fair bit of experience, a quiet and gentle disposition, and likes playing drums, it's easier to (a) relate to him, and (b) create stories and situations around him.

The character's background story is best written by the author.

We need to write a background story for:

- [ ] Dee
- [ ] Dey
- [ ] Ringo
- [ ] Priya
- [ ] Aryan
- [ ] Zoe
- [ ] Facesketch
- [ ] Humaans

We also need to:

- [ ] Create a character page on the website that describes each character
- [ ] Document the process. Each new character must come with a story