move jquery-datetimepicker to npm/webpack (#10713)

- update to latest version and move to npm
- adapt for api changes and css class rename
- add specificity to arc-green rules as dependency css now loads later
- use imports-loader to make it load correctly
- fix some wrong paths in librejs

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

package.json

@@ -11,6 +11,7 @@
     "fomantic-ui": "2.8.4",
     "highlight.js": "9.18.1",
     "jquery": "3.4.1",
+    "jquery-datetimepicker": "2.5.21",
     "jquery-migrate": "3.1.0",
     "jquery.are-you-sure": "1.9.0",
     "swagger-ui": "3.25.0",
@@ -33,6 +34,7 @@
     "eslint-config-airbnb-base": "14.1.0",
     "eslint-plugin-import": "2.20.1",
     "fast-glob": "3.2.2",
+    "imports-loader": "0.8.0",
     "less-loader": "5.0.0",
     "mini-css-extract-plugin": "0.9.0",
     "optimize-css-assets-webpack-plugin": "5.0.3",