feat: Add sea theme (#306)

Author: Андрей Кожев

docs/themes.md

@@ -91,6 +91,7 @@ You can also try out and customize these themes on the [Demo Site](https://githu
 |        `windows-dark`         | ![image](https://user-images.githubusercontent.com/103951737/183449796-23096f23-54b5-45af-8078-b8afd4f3baf3.png) |
 |          `git-dark`           | ![image](https://user-images.githubusercontent.com/103951737/183690748-060943ff-7b39-4229-b32d-806d654bd12d.png) |
 |         `python-dark`         | ![image](https://user-images.githubusercontent.com/103951737/183929763-ae8c93d4-0106-461c-bded-2c2adb0bd6bf.png) |
+|             `sea`             | ![image](https://user-images.githubusercontent.com/103951737/184303266-0e5f8a25-bfeb-4876-abf1-91a38ca87680.png) |
 
 ### Can't find the theme you like?
 

src/themes.php

@@ -1022,4 +1022,16 @@
         "sideLabels" => "#FFD43B",
         "dates" => "#FFD43B",
     ],
+    "sea" => [
+        "background" => "#1565C0",
+        "border" => "#FFFFFF",
+        "stroke" => "#FFFFFF",
+        "ring" => "#FFFFFF",
+        "fire" => "#FFFFFF",
+        "currStreakNum" => "#FFFFFF",
+        "sideNums" => "#FFFFFF",
+        "currStreakLabel" => "#FFFFFF",
+        "sideLabels" => "#FFFFFF",
+        "dates" => "#FFFFFF",
+    ],
 ];