Copy citation file content, in APA and BibTex format, on repo home page (#19999)

Add feature to easily copy CITATION.cff content in APA and BibTex format.

package.json

@@ -7,6 +7,10 @@
     "node": ">= 14.0.0"
   },
   "dependencies": {
+    "@citation-js/core": "0.6.1",
+    "@citation-js/plugin-bibtex": "0.6.1",
+    "@citation-js/plugin-csl": "0.6.3",
+    "@citation-js/plugin-software-formats": "0.6.0",
     "@claviska/jquery-minicolors": "2.3.6",
     "@mcaptcha/vanilla-glue": "0.1.0-alpha-3",
     "@primer/octicons": "17.7.0",