Revamp "Continue: Web Applications in Racket"

Here's a list of improvements that I wish to see:

Better spacing

The following image shows one of the issues.

There's too much space before the box, and not enough space after the box.

Consistent usage of contract

There's a weird mix of HtDP-style signature and actual Racket contract throughout the tutorial, which is confusing. We should pick one style and use it consistently.

Slightly off-topic, but while I know that the tutorial's target audience is readers of the first edition of HtDP, I'm not sure if that makes sense anymore.

Use appropriate tags

Several @tt should have been @litchar.

Linkify code

All links under #lang web-server/insta are broken.

Consistent naming

Right now, functions whose name is prefixed with render- are used in two different ways: they might return an xexp/c or a response?. It would be nice to make things consistent. Perhaps make-XXX-request for functions that return response? and render-XXX for functions that return xexpr/c?

Avoid "request" as an argument name.

This is to avoid incorrect linkified text.

Start by locating the “Continue: Web Applications in Racket” tutorial and reviewing the sections using #lang web-server/insta. Address the listed spacing, contract, tag, link, naming, and argument-name inconsistencies; done means the tutorial is visually consistent, links work, and its terminology is internally consistent.