Update scripts, and add README

Update base tiddlywiki

Add HTML. Moved 2021 tag.

Add attributes

Fix error responses section (was actually sending two responses).

Build

Fix background of svgs for dark theme

Fix background consistency in dark theme

Build.

Removed extra space after link macros.

Improvements to sequence tutorial. ...

All the stuff that I didn't have time to due during the semester:

* Fixed some minor inconsistencies between diagrams.
* Added some code examples where appropriate.
* Added section on data fields.

Removed incomplete tag, fixed typo in title

Publish mode

Release updated version

Add alpha to diagram backgrounds to dedazzle them in the dark theme

Embedded diagrams in sequence tutorial. Also split out the sections.

Fixes to assorted issues that have been noted recently.

Fix silent error in 500 handler

Remove nss from Mac CAROOT

Lab 13

General clean up. Embed images. Add icon macro.

Fix wonky section numbers.

Complete lab 12

WIP lab 12.

Minor tweak to code font style

Remove heavy plus char that is actually tiny in noto-sans.

Improve some bits that caused problems for students.

Move files into correct location

s/JDBC/JDBI/

req.param -> ctx.path