Cleanup: Remove clipboard package (#3925)

- Remove the unused `clipboard` npm package and the vendored Doks script
that injected a bare copy button into every code block. `snippets.js`
already adds its own copy button, so the old flow was inject, delete,
re-add
- Drop the `clipBoard` site option, its template branch, and the
`removeCopyButton` helper in `snippets.js`. This also removes a latent
crash: the helper called `removeChild` on a possibly null element
- Remove unused scss files

Author: garrying

assets/js/clipboard.js

@@ -1,8 +1,3 @@
-const removeCopyButton = (pre) => {
-  const copyButton = pre.querySelector(".btn.btn-copy");
-  pre.removeChild(copyButton);
-};
-
 function toast(textContent) {
   const notification = document.getElementById("notification");
   const notificationText = document.getElementById("notification-text");
@@ -74,7 +69,6 @@ const expandCode = (expanded, codeContent, expandButtonText, expandIcon) => {
 };
 
 const customizeUI = (pre) => {
-  removeCopyButton(pre); // remove original copy button
   const codeContent = pre.querySelector("code");
   codeContent.classList.add("code");
 

assets/js/snippets.js

@@ -13,8 +13,6 @@ $bootstrap-icons-font-dir: "/fonts";
 @import "bootstrap-icons/font/bootstrap-icons.scss";
 
 /** Import legacy and layout styles */
-@import "components/comments";
-@import "components/forms";
 @import "layouts/footer";
 @import "layouts/header";
 @import "layouts/pages";