remove VERSIONS file (#10070)

It serves no clear purpose and is not used anywhere to my knowledge.
Also, it's name to version mapping doesn't work with bundling.

public/vendor/VERSIONS

@@ -1,63 +0,0 @@
-# About: This file was added per request of BKC. It duplicates content present in librejs.html.
-# To do: Choose a dependency management solution and use it to replace both files.
-# Notes:  Download and license information is available in librejs.html.
-
-File(s): /vendor/plugins/jquery/jquery.min.js
-Version: 3.4.1
-
-File(s): /vendor/plugins/jquery-migrate/jquery-migrate.min.js
-Version: 3.0.1
-
-File(s): /fomantic/semantic.min.js
-Version: 2.8.2
-
-File(s): /vendor/plugins/clipboard/clipboard.min.js
-Version: 1.5.9
-
-File(s): /vendor/plugins/vue/vue.min.js
-Version: 2.1.10
-
-File(s): /vendor/plugins/emojify/emojify.custom.js
-Version: 1.1.0
-
-File(s): /vendor/plugins/dropzone/dropzone.js
-Version: 4.2.0
-
-File(s): /js/highlight.js
-Version: 9.18.0
-
-File(s): /vendor/plugins/jquery.datetimepicker/jquery.datetimepicker.js
-Version: 2.4.5
-
-File(s): /vendor/plugins/jquery.minicolors/jquery.minicolors.min.js
-Version: 2.2.3
-
-File(s): /vendor/plugins/codemirror/
-Version: 5.49.0
-
-File(s): /vendor/plugins/simplemde/simplemde.min.js
-Version: 1.10.1
-
-File(s): /vendor/plugins/pdfjs/
-Version: 2.1.266
-
-File(s): /vendor/plugins/u2f/
-Version: 1.0.8
-
-File(s): /vendor/assets/font-awesome/fonts/
-Version: 4.6.0
-
-File(s): /vendor/assets/octicons/
-Version: 4.3.0
-
-File(s): /vendor/assets/swagger-ui/
-Version: 3.0.4
-
-File(s): /vendor/plugins/d3/
-Version: 4.13.0
-
-File(s): /vendor/plugins/calendar-heatmap/
-Version: 337b431
-
-File(s): /vendor/plugins/moment/
-Version: 2.22.2