new icon: leetcode (original, plain, line, original-wordmark, plain-wordmark, line-wordmark) (#2152)

* Added: leetcode icons

* Added: leetcode icons in devicon.json

* Optimized: leetcode-original.svg

* Optimized: leetcode-plain.svg

* Optimized: leetcode-line.svg

* Updated Aliases in devicon.json

* Apply suggestions from code review

- add plain icon to font
- shorten `#000000` to `#000`

* Create leetcode-original-wordmark.svg

* Create leetcode-line-wordmark.svg

* Create leetcode-plain-wordmark.svg

* add wordmark versions

* change color to `#ffa116`

* Rename icons/leetcode-plain-wordmark.svg to icons/leetcode/leetcode-plain-wordmark.svg

* Update leetcode-plain-wordmark.svg

recreate the plain version using the non-optimized original version

---------

Co-authored-by: Alex Canales <49886351+canaleal@users.noreply.github.com>
Co-authored-by: Jørgen Kalsnes Hagen <43886029+Snailedlt@users.noreply.github.com>

Author: 3 people

devicon.json

@@ -6829,6 +6829,36 @@
             }
         ]
     },
+    {
+        "name": "leetcode",
+        "altnames": [],
+        "tags": [
+            "online-platform",
+            "coding-platform",
+            "platform",
+            "coding",
+            "dsa",
+            "interview-preparation"
+        ],
+        "versions": {
+            "svg": [
+                "original",
+                "plain",
+                "line",
+                "original-wordmark",
+                "plain-wordmark",
+                "line-wordmark"
+            ],
+            "font": [
+                "plain",
+                "line",
+                "plain-wordmark",
+                "line-wordmark"
+            ]
+        },
+        "color": "#ffa116",
+        "aliases": []
+    },
     {
         "name": "less",
         "altnames": [