Add more supported deck image types

[mProjectsCode]

Sorry, but I haven't tested this, but it should (😅) work. :)

For .svg files the mime type is image/svg+xml so we need an extra check in there.

[alexkurowski]

Ah, I'm sorry I've updated the file before noticing your PR.

Would you wish to resolve the conflicts, or can I push your changes myself? I think it could look something like this:

--- a/src/utils/customdeck.ts
+++ b/src/utils/customdeck.ts
@@ -10,7 +10,7 @@ export class CustomDeck {
   deckCards: TFile[];
   flip: number[] = [0];

-  private supportedExtensions = ["jpg", "jpeg", "png"];
+  private supportedExtensions = ["jpg", "jpeg", "png", "webp", "bmp", "svg"];

   constructor(vault: Vault, folder: TFolder) {
     this.vault = vault;
@@ -72,9 +72,10 @@ export class CustomDeck {
     }

     const bytes = await this.vault.readBinary(file);
-    const value =
-      `data:image/${file.extension.replace("jpg", "jpeg")};base64,` +
-      arrayBufferToBase64(bytes);
+    const contentType =
+      "image/" +
+      file.extension.replace("jpg", "jpeg").replace("svg", "svg+xml");
+    const value = `data:${contentType};base64,` + arrayBufferToBase64(bytes);
     return {
       image: value,
       flip: randomFrom(this.flip),

Also, I think there's no need to downcase file.extension, I've tested different casings and it looks like Obsidian does it by itself when TFile is created.