doc: don't load external resources

doc/Makefile

@@ -3,6 +3,9 @@ OUT_DIR=out
 $(OUT_DIR)/hamnet70.html: hamnet70.adoc
 	mkdir -p $(OUT_DIR)
 	asciidoctor -D $(OUT_DIR) -r asciidoctor-diagram $<
+	@# Use local files to prevent privacy issues
+	cp -a ext/* $(OUT_DIR)
+	sed -i 's!src="[^"]*mathjax[^"]*"!src="mathjax-2.7.9-tex-mml-am-html-or-mml.js"!' $@
 
 .PHONY: clean
 clean:

doc/hamnet70.adoc

@@ -3,6 +3,7 @@ Thomas Kolb DL5TKL
 0.1, 2024-04-25
 :toc:
 :stem:
+:webfonts!:
 
 // SPDX-License-Identifier: CC-BY-SA-4.0
 // List of contributors is at the end of the document.