column: Document CSS nodes and style classes

So app devs know they can use them.
12 jobs for leaflet-style-class-doc in 17 minutes and 7 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Build
passed #240149
librem5
api-visibility

00:02:52

passed #240152
librem5
build-debian-clang

00:03:58

passed #240150
librem5
build-debian-gcc

00:03:25

passed #240151
librem5
build-debian-gcc-static

00:03:20

passed #240153
librem5
build-fedora-gcc

00:03:01

 
  Test+Docs
passed #240154
librem5
build-gtkdoc

00:02:30

passed #240155
librem5
unit-test

00:02:28

43.8%
 
  Package
passed #240156
librem5
package-debian-buster

00:02:31

passed #240157
librem5:arm64
package-debian-buster:arm64

00:05:47

passed #240158
flatpak
package-flatpak

00:02:07

 
  Test Package
passed #240159
librem5
autopkgtest-debian-buster-package

00:02:52

passed #240160
librem5
lintian-debian-buster-package

00:01:07