new icon: RxJS (original, plain) (#1883)

* Added rxjs icon

* Added new lines and unified paths for plain svg

---------

Co-authored-by: Jørgen Kalsnes Hagen <43886029+Snailedlt@users.noreply.github.com>

Author: canaleal

devicon.json

@@ -8669,6 +8669,28 @@
         "color": "#000000",
         "aliases": []
     },
+    {
+        "name": "rxjs",
+        "altnames": [
+            "Reactive Extensions for JavaScript"
+        ],
+        "tags": [
+            "javascript",
+            "library",
+            "observability"
+        ],
+        "versions": {
+            "svg": [
+                "original",
+                "plain"
+            ],
+            "font": [
+                "plain"
+            ]
+        },
+        "color": "#df1c85",
+        "aliases": []
+    },
     {
         "name": "safari",
         "altnames": [