[add versions everywhere]

_config.yml

@@ -488,7 +488,7 @@ third_party_libraries:
     integrity:
       js: "sha256-htrLFfZJ6v5udOG+3kNLINIKh2gvoKqwEhHYfTTMICc="
     url:
-      js: https://cdn.jsdelivr.net/npm/imagesloaded@{{version}}/imagesloaded.pkgd.min.js
+      js: https://cdn.jsdelivr.net/npm/imagesloaded@5.0.0/imagesloaded.pkgd.min.js
     version: "5.0.0"
   img-comparison-slider:
     integrity:
@@ -525,14 +525,14 @@ third_party_libraries:
     local:
       fonts: "output/chtml/fonts/woff-v2/"
     url:
-      fonts: "https://cdn.jsdelivr.net/npm/mathjax@{{version}}/es5/output/chtml/fonts/woff-v2/"
-      js: "https://cdn.jsdelivr.net/npm/mathjax@{{version}}/es5/tex-mml-chtml.js"
+      fonts: "https://cdn.jsdelivr.net/npm/mathjax@3.2.2/es5/output/chtml/fonts/woff-v2/"
+      js: "https://cdn.jsdelivr.net/npm/mathjax@3.2.2/es5/tex-mml-chtml.js"
     version: "3.2.2"
   masonry:
     integrity:
       js: "sha256-Nn1q/fx0H7SNLZMQ5Hw5JLaTRZp0yILA/FRexe19VdI="
     url:
-      js: "https://cdn.jsdelivr.net/npm/masonry-layout@{{version}}/dist/masonry.pkgd.min.js"
+      js: "https://cdn.jsdelivr.net/npm/masonry-layout@4.2.2/dist/masonry.pkgd.min.js"
     version: "4.2.2"
   mdb:
     integrity:
@@ -560,7 +560,7 @@ third_party_libraries:
     version: "10.7.0"
   polyfill:
     url:
-      js: "https://cdnjs.cloudflare.com/polyfill/v{{version}}/polyfill.min.js?features=es6"
+      js: "https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js?features=es6"
     version: "3"
   pseudocode:
     integrity: