fix(data/smartphone): null out 367 broken placeholder image_url values

Author: Seungpyo1007

data/smartphone/apple/2012/iphone-5.json

@@ -28,7 +28,7 @@
   "os": "iOS",
   "os_version": "6",
   "connectivity": {"wifi": "Wi-Fi 4", "bluetooth": "4.0", "nfc": false, "usb": "Lightning"},
-  "image_url": "https://cdn.jsdelivr.net/gh/GetTechAPI/images/smartphones/iphone-5.webp",
+  "image_url": null,
   "verified": true,
   "source_urls": [
     "https://en.wikipedia.org/wiki/IPhone_5",

data/smartphone/apple/2013/iphone-5c.json

@@ -28,7 +28,7 @@
   "os": "iOS",
   "os_version": "7",
   "connectivity": {"wifi": "Wi-Fi 4", "bluetooth": "4.0", "nfc": false, "usb": "Lightning"},
-  "image_url": "https://cdn.jsdelivr.net/gh/GetTechAPI/images/smartphones/iphone-5c.webp",
+  "image_url": null,
   "verified": true,
   "source_urls": [
     "https://en.wikipedia.org/wiki/IPhone_5c",

data/smartphone/apple/2013/iphone-5s.json

@@ -28,7 +28,7 @@
   "os": "iOS",
   "os_version": "7",
   "connectivity": {"wifi": "Wi-Fi 4", "bluetooth": "4.0", "nfc": false, "usb": "Lightning"},
-  "image_url": "https://cdn.jsdelivr.net/gh/GetTechAPI/images/smartphones/iphone-5s.webp",
+  "image_url": null,
   "verified": true,
   "source_urls": [
     "https://en.wikipedia.org/wiki/IPhone_5s",

data/smartphone/apple/2014/iphone-6-plus.json

@@ -28,7 +28,7 @@
   "os": "iOS",
   "os_version": "8",
   "connectivity": {"wifi": "Wi-Fi 5", "bluetooth": "4.0", "nfc": true, "usb": "Lightning"},
-  "image_url": "https://cdn.jsdelivr.net/gh/GetTechAPI/images/smartphones/iphone-6-plus.webp",
+  "image_url": null,
   "verified": true,
   "source_urls": [
     "https://en.wikipedia.org/wiki/IPhone_6",

data/smartphone/apple/2014/iphone-6.json

@@ -28,7 +28,7 @@
   "os": "iOS",
   "os_version": "8",
   "connectivity": {"wifi": "Wi-Fi 5", "bluetooth": "4.0", "nfc": true, "usb": "Lightning"},
-  "image_url": "https://cdn.jsdelivr.net/gh/GetTechAPI/images/smartphones/iphone-6.webp",
+  "image_url": null,
   "verified": true,
   "source_urls": [
     "https://en.wikipedia.org/wiki/IPhone_6",

data/smartphone/apple/2015/iphone-6s-plus.json

@@ -28,7 +28,7 @@
   "os": "iOS",
   "os_version": "9",
   "connectivity": {"wifi": "Wi-Fi 5", "bluetooth": "4.2", "nfc": true, "usb": "Lightning"},
-  "image_url": "https://cdn.jsdelivr.net/gh/GetTechAPI/images/smartphones/iphone-6s-plus.webp",
+  "image_url": null,
   "verified": true,
   "source_urls": [
     "https://en.wikipedia.org/wiki/IPhone_6s",

data/smartphone/apple/2015/iphone-6s.json

@@ -28,7 +28,7 @@
   "os": "iOS",
   "os_version": "9",
   "connectivity": {"wifi": "Wi-Fi 5", "bluetooth": "4.2", "nfc": true, "usb": "Lightning"},
-  "image_url": "https://cdn.jsdelivr.net/gh/GetTechAPI/images/smartphones/iphone-6s.webp",
+  "image_url": null,
   "verified": true,
   "source_urls": [
     "https://en.wikipedia.org/wiki/IPhone_6s",

data/smartphone/apple/2016/iphone-7-plus.json

@@ -29,7 +29,7 @@
   "os": "iOS",
   "os_version": "10",
   "connectivity": {"wifi": "Wi-Fi 5", "bluetooth": "4.2", "nfc": true, "usb": "Lightning"},
-  "image_url": "https://cdn.jsdelivr.net/gh/GetTechAPI/images/smartphones/iphone-7-plus.webp",
+  "image_url": null,
   "verified": true,
   "source_urls": [
     "https://en.wikipedia.org/wiki/IPhone_7",

data/smartphone/apple/2016/iphone-7.json

@@ -28,7 +28,7 @@
   "os": "iOS",
   "os_version": "10",
   "connectivity": {"wifi": "Wi-Fi 5", "bluetooth": "4.2", "nfc": true, "usb": "Lightning"},
-  "image_url": "https://cdn.jsdelivr.net/gh/GetTechAPI/images/smartphones/iphone-7.webp",
+  "image_url": null,
   "verified": true,
   "source_urls": [
     "https://en.wikipedia.org/wiki/IPhone_7",

data/smartphone/apple/2016/iphone-se-1st-gen.json

@@ -28,7 +28,7 @@
   "os": "iOS",
   "os_version": "9",
   "connectivity": {"wifi": "Wi-Fi 5", "bluetooth": "4.2", "nfc": true, "usb": "Lightning"},
-  "image_url": "https://cdn.jsdelivr.net/gh/GetTechAPI/images/smartphones/iphone-se-1st-gen.webp",
+  "image_url": null,
   "verified": true,
   "source_urls": [
     "https://en.wikipedia.org/wiki/IPhone_SE_(1st_generation)",