We install these frontend libraries in the `prepare` step.

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ae86ce9..8a108d1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -82,14 +82,7 @@ add_custom_command(OUTPUT index_html_size.h
     COMMAND sh -c '( echo -n "\\#define INDEX_HTML_UNCOMPRESSED_SIZE " && wc -c < "${CMAKE_SOURCE_DIR}/src/resources/index.html" ) > index_html_size.h'
     DEPENDS src/resources/index.html)
 
-# Download 3rd-party frontend JS libs...
-file(DOWNLOAD https://cdnjs.cloudflare.com/ajax/libs/vue/2.6.12/vue.min.js
-	js/vue.min.js EXPECTED_MD5 fb192338844efe86ec759a40152fcb8e)
-file(DOWNLOAD https://raw.githubusercontent.com/drudru/ansi_up/v4.0.4/ansi_up.js
-        js/ansi_up.js EXPECTED_MD5 b31968e1a8fed0fa82305e978161f7f5)
-file(DOWNLOAD https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.9.1/chart.min.js
-        js/Chart.min.js EXPECTED_MD5 7dd5ea7d2cf22a1c42b43c40093d2669)
-# ...and compile them
+# Compile 3rd-party frontend JS libs...
 generate_compressed_bins(${CMAKE_BINARY_DIR} js/vue.min.js
     js/ansi_up.js js/Chart.min.js)
 # (see resources.cpp where these are fetched)