Make the source of the static assets configurable

- Easy to switch between different CDN
- Allow self-host static assets

_data/assets/self_host.yml

@@ -0,0 +1,54 @@
+# fonts
+
+webfonts: /assets/lib/fonts/main.css
+
+# Libraries
+
+jquery:
+  js: /assets/lib/jquery-3.6.0/jquery.min.js
+
+bootstrap:
+  css: /assets/lib/bootstrap-4.6.1/bootstrap.min.css
+  js: /assets/lib/bootstrap-4.6.1/bootstrap.bundle.min.js
+
+bootstrap-toc:
+  css: /assets/lib/bootstrap-toc-1.0.1/bootstrap-toc.min.css
+  js: /assets/lib/bootstrap-toc-1.0.1/bootstrap-toc.min.js
+
+fontawesome:
+  css: /assets/lib/fontawesome-free-5.15.4/css/all.min.css
+
+search:
+  js: /assets/lib/simple-jekyll-search-1.10.0/simple-jekyll-search.min.js
+
+mermaid:
+  js: /assets/lib/mermaid-8.13.10/mermaid.min.js
+
+dayjs:
+  js:
+    common: /assets/lib/dayjs-1.10.7/dayjs.min.js
+    locale: /assets/lib/dayjs-1.10.7/locale/en.min.js
+    relativeTime: /assets/lib/dayjs-1.10.7/plugin/relativeTime.min.js
+    localizedFormat: /assets/lib/dayjs-1.10.7/plugin/localizedFormat.min.js
+
+countup:
+  js: /assets/lib/countup.js-1.9.3/countUp.min.js
+
+magnific-popup:
+  css: /assets/lib/magnific-popup-1.1.0/magnific-popup.css
+  js: /assets/lib/magnific-popup-1.1.0/jquery.magnific-popup.min.js
+
+lozad:
+  js: /assets/lib/lozad-1.16.0/lozad.min.js
+
+clipboard:
+  js: /assets/lib/clipboard-2.0.9/clipboard.min.js
+
+polyfill:
+  js: /assets/lib/polyfill-v3-es6/polyfill.min.js
+
+mathjax:
+  js: /assets/lib/mathjax-3.2.0/tex-chtml.js
+
+utterances:
+  js: /assets/lib/utterances/client.js