Improved node docs

[RunDevelopment]

Changes:

• Removed examples API.
• Added "See Also" section. It just contains links to other nodes.
• Changed python API for descriptions. All methods that take secription now support lists. Lists items are joined together using \n\n. This makes it easy to write paragraphs. E.g. withDocs("para1", "para2")
• Renamed widthDocumentation to withDocs.
• Changed links to other nodes. Instead of using empty links, I switched to inline code. E.g. `chainner:ncnn:load_model`. This is easier to use, and it gives us something to fall back on when the schema id is invalid (e.g. because the node isn't installed).
• Added more documentation to a few nodes.

[joeyballentine]

I didn't mean to approve that. I think you missed the markdown customization in the node description tooltips -- those have to properly convert the schema ID code block to a node name as well