add Siebe and change status for Pauline (#33)

* add: Siebe

* Update people.json

Added information on Siebe

---------

Co-authored-by: SiebeGeurts <58730778+SiebeGeurts@users.noreply.github.com>

Author: CharlieLeee

data/people.json

@@ -130,6 +130,19 @@
     "tags": ["behavior analysis"],
     "status": "current"
   },
+  {
+    "id": "siebe-geurts",
+    "name": "Siebe Geurts",
+    "role": "PhD Student",
+    "avatar": "/images/people/siebe-geurts.jpg",
+    "project": "Proprioceptive Illusions",
+    "cosupervised": "Prof. Olaf Blanke",
+    "links": {
+      "website": "https://people.epfl.ch/siebe.geurts"
+    },
+    "tags": [proprioception, sensorimotor system],
+    "status": "current"
+  },
   {
     "id": "arash",
     "name": "Arash Sal Moslehian",
@@ -165,7 +178,7 @@
     "project": "",
     "note": "",
     "tags": ["lab management"],
-    "status": "current"
+    "status": "alumni"
   },
   {
     "id": "vanessa-ciherean",