Add particles.js detection (#2156)

This can be checked [here](http://pwning.fun/) and [here](https://vincentgarreau.com/particles.js/).
It has ~14.000 stars in github, and is used on a metric fuckton of websites
who want a fancy background. Unfortunately, it doesn't have an icon yet.

src/apps.json

@@ -11784,6 +11784,17 @@
       },
       "website": "http://owncloud.org"
     },
+    "particles.js": {
+      "cats": [
+        25
+      ],
+      "js": {
+        "particleJS": ""
+      },
+      "script": "/particles(?:\\min)?\\.js",
+      "html": "<div id=\"particles\\-js\">",
+      "website": "https://vincentgarreau.com/particles.js/"
+    },
     "papaya CMS": {
       "cats": [
         1