… when diagram was above (ByteByteGoHq#69)

fixed order of diagram and text, text was pointing to diagram "below",
when diagram was above

…ADME.md (ByteByteGoHq#68)

Changed "We can `cache` frequently accessed data into a cache." to "We
can `store` frequently accessed data into a cache."

This PR adds all the guides from [Visual
Guides](https://bytebytego.com/guides/) section on bytebytego to the
repository with proper links.

- [x] Markdown files for guides and categories are placed inside
`data/guides` and `data/categories`
- [x] Guide links in readme are auto-generated using
`scripts/readme.ts`. Everytime you run the script `npm run
update-readme`, it reads the categories and guides from the above
mentioned folders, generate production links for guides and categories
and populate the table of content in the readme. This ensures that any
future guides and categories will automatically get added to the readme.
- [x] Sorting inside the readme matches the actual category and guides
sorting on production

* Adds a workflow to greet first time contributors
* Update contribution guidelines