Docs IA 2.0: Images (vercel#78769)

Closes:
- https://linear.app/vercel/issue/DOC-4626/images
- https://linear.app/vercel/issue/DOC-4610/split-image-and-font-pages

Redirects: vercel#78769

**Housekeeping:** 
- Deletes BYA images page
- Creates relevant getting started docs in `/pages`
- Splits "Images and Fonts" into "Images" and "Fonts" pages to allow us
to add more context to each page in the future

**API reference**: 
- Improves image API reference to follow more of a consistent format and
language
- Adds examples

**Follow-up:** vercel#78857
- Create a Deep Dive Guide on how image optimization works

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Co-authored-by: Rich Haines <hello@richardhaines.dev>

Author: delbaoliveira