fix(data): add missing photos for Joe Rogers, Robert Ashby, Vijay Gill

- Joe Rogers: add 2 photos from issue #19 (provided by his widow),
  set main image
- Robert Ashby: add photo from hackerphotos.com (issue #13)
- Vijay Gill: add obituary photo and gallery photo (issue #232),
  set main image

people/joerogers.json

@@ -7,9 +7,15 @@
   "obituary": "https://loylessfuneralhomes.com/tribute/details/140691/Joseph-Rogers-III/obituary.html",
   "issue": "19",
   "affiliations": "Legitimate Business Syndicate, University of South Florida",
-  "mainimage": "/images/face-silhouette-clipart.png",
+  "mainimage": "/images/JoeRogers2.jpg",
   "maintext": "<p>Joseph Hinton Rogers III, known as Selir, was born May 4, 1974 in Lakeland, Florida. He earned two bachelor's degrees in Computer Science and Computer Engineering, as well as a master's degree in Computer Engineering, all from the University of South Florida. Joe worked as a network administrator at USF for 25 years.</p><p>He was a member of the Legitimate Business Syndicate CTF team at DEF CON for five to six years, earning six to seven black badges. His handle \"Selir\" came from a Pathfinder character he played. Joe was an avid biker and tabletop gamer.</p><p>Joe passed away on June 12, 2019 after a two-and-a-half-year battle with colon cancer. He is survived by his wife.</p>",
   "socialmedialinks": [],
   "contributions": [],
-  "gallery": []
+  "gallery": [
+    {
+      "url": "/images/JoeRogers1.jpg",
+      "title": "",
+      "caption": "Photo provided by his widow"
+    }
+  ]
 }

people/robertashby.json

@@ -11,5 +11,11 @@
   "maintext": "<p>Poolboy, aka Robert Conner Ashby, 19, of Ventura, passed away on Monday, Nov. 21, 2011.</p>",
   "socialmedialinks": [],
   "contributions": [],
-  "gallery": []
+  "gallery": [
+    {
+      "url": "/images/RobertAshby.jpg",
+      "title": "",
+      "caption": ""
+    }
+  ]
 }

people/vijaygill.json

@@ -7,7 +7,7 @@
   "obituary": "https://www.legacy.com/us/obituaries/name/vijay-gill-obituary?id=36166748",
   "issue": "232",
   "affiliations": "IAB, IETF, NANOG",
-  "mainimage": "/images/face-silhouette-clipart.png",
+  "mainimage": "/images/VijayGill.jpg",
   "maintext": "<p>Vijay Gill was a prolific network engineer employed by various ISPs and hyperscale networks including UUNet, AOL, Microsoft, Google, and Salesforce. He was a contributor to the wider Internet community through his involvement with the IETF, IAB, and NANOG, and co-authored multiple RFCs related to Internet architecture and routing.</p>",
   "socialmedialinks": [
     {
@@ -27,5 +27,11 @@
       "description": "Co-authored RFC on BGP MED attribute considerations for network routing."
     }
   ],
-  "gallery": []
+  "gallery": [
+    {
+      "url": "/images/VijayGill-robe.jpg",
+      "title": "",
+      "caption": ""
+    }
+  ]
 }