feat: Added "halloween" streak stats theme (#346)

Author: DenverCoder1

docs/themes.md

@@ -98,6 +98,7 @@ You can also try out and customize these themes on the [Demo Site](https://strea
 |          `material`           | ![image](https://user-images.githubusercontent.com/20955511/193617994-dfab039d-b111-4a95-a00d-39517d9e40ab.png)  |
 |        `modern-lilac`         | ![image](https://user-images.githubusercontent.com/20955511/197569406-6ff144c3-1d6e-4500-9f0b-3112a6c62584.png)  |
 |        `modern-lilac2`        | ![image](https://user-images.githubusercontent.com/20955511/197575977-029fc730-9c7e-4556-be7c-a727a1715fa7.png)  |
+|          `halloween`          | ![image](https://user-images.githubusercontent.com/20955511/198897937-a3c918ea-0f35-43a0-9faf-80ad8f254cdf.png)  |
 
 ### Can't find the theme you like?
 

src/themes.php

@@ -1106,4 +1106,16 @@
         "sideLabels" => "#c770f0",
         "dates" => "#FFFFFF",
     ],
+    "halloween" => [
+        "background" => "#1C1A2B",
+        "border" => "#FFC400",
+        "stroke" => "#FFC400",
+        "ring" => "#FDEF49",
+        "fire" => "#FDEF49",
+        "currStreakNum" => "#FFC400",
+        "sideNums" => "#FFC400",
+        "currStreakLabel" => "#FB9600",
+        "sideLabels" => "#FB9600",
+        "dates" => "#FFC400",
+    ],
 ];