10-print header works :)

I had to pin @thi.ng/hiccup to an earlier version because they stopped publishing CommonJS modules. There is [an issue tracking EcmaScript module support in 11ty](https://github.com/11ty/eleventy/issues/836) but it has not been fixed yet and other solutions broke unpredictably by messing with template inheritance.

pnpm-lock.yaml

@@ -2,11 +2,17 @@ lockfileVersion: 5.3
 
 specifiers:
   '@11ty/eleventy': ^1.0.0
+  '@thi.ng/hiccup': 3.6.22
+  lodash: ^4.17.21
   luxon: ^2.3.0
+  seedrandom: ^3.0.5
 
 devDependencies:
   '@11ty/eleventy': 1.0.0
+  '@thi.ng/hiccup': 3.6.22
+  lodash: 4.17.21
   luxon: 2.3.0
+  seedrandom: 3.0.5
 
 packages:
 
@@ -117,6 +123,28 @@ packages:
       lodash.deburr: 4.1.0
     dev: true
 
+  /@thi.ng/api/7.2.0:
+    resolution: {integrity: sha512-4NcwHXxwPF/JgJG/jSFd9rjfQNguF0QrHvd6e+CEf4T0sFChqetW6ZmJ6/a2X+noDVntgulegA+Bx0HHzw+Tyw==}
+    dev: true
+
+  /@thi.ng/checks/2.9.11:
+    resolution: {integrity: sha512-fBvWod32w24JlJsrrOdl+tlx+UNehCORi4rHaJ7l7HH+SEhD/lYTCXOBjwu9D/ztIUjMP5Q+n8cAqI5iPhbvAQ==}
+    dependencies:
+      tslib: 2.3.1
+    dev: true
+
+  /@thi.ng/errors/1.3.4:
+    resolution: {integrity: sha512-hTk71OPKnioN349sdj2DAoY+69eSerB3MN4Zwz6mosr1QFzIMkfkNOtBeC+Gm0yi0V0EY5LeBYFgqb3oXbtTbw==}
+    dev: true
+
+  /@thi.ng/hiccup/3.6.22:
+    resolution: {integrity: sha512-Ev6SzcjJyNVtvwFcNVRQ4wM2TZQA2gPmJIUOvP5i3q/S2qOnq6L+h7XhDkDV6wAs8gl6eu3KRBbcbTpZabAe7w==}
+    dependencies:
+      '@thi.ng/api': 7.2.0
+      '@thi.ng/checks': 2.9.11
+      '@thi.ng/errors': 1.3.4
+    dev: true
+
   /@types/minimatch/3.0.5:
     resolution: {integrity: sha512-Klz949h02Gz2uZCMGwDUSDS1YBlTdDDgbWHi+81l29tQALUtvz4rAYi5uoVhE5Lagoq6DeqAUlbrHvW/mXDgdQ==}
     dev: true
@@ -1742,6 +1770,10 @@ packages:
       kind-of: 6.0.3
     dev: true
 
+  /seedrandom/3.0.5:
+    resolution: {integrity: sha512-8OwmbklUNzwezjGInmZ+2clQmExQPvomqjL7LFqOYqtmuxRgQYqOD3mHaU+MvZn5FLUeVxVfQjwLZW/n/JFuqg==}
+    dev: true
+
   /semver-compare/1.0.0:
     resolution: {integrity: sha1-De4hahyUGrN+nvsXiPavxf9VN/w=}
     dev: true
@@ -1999,6 +2031,10 @@ packages:
     resolution: {integrity: sha1-zCAOqyYT9BZtJ/+a/HylbUnfbrQ=}
     dev: true
 
+  /tslib/2.3.1:
+    resolution: {integrity: sha512-77EbyPPpMz+FRFRuAFlWMtmgUWGe9UOG2Z25NqCwiIjRhOf5iKGuzSe5P2w1laq+FkRy4p+PCuVkJSGkzTEKVw==}
+    dev: true
+
   /ua-parser-js/1.0.2:
     resolution: {integrity: sha512-00y/AXhx0/SsnI51fTc0rLRmafiGOM4/O+ny10Ps7f+j/b8p/ZY11ytMgznXkOVo4GQ+KwQG5UQLkLGirsACRg==}
     dev: true