feat(auth): added discord & github authentication methods (#18)

* feat(auth): added discord & github authentication methods

* chore(format): formatted edited files

* docs: add Discord and GitHub OAuth environment variables to README

* feat: add Discord and GitHub OAuth client credentials to environment config

* refactor: migrate social provider types to better-auth package

* feat: return configured social provider names from auth endpoint

* refactor: simplify socialProvidersPlugin by removing nested function and condensing return

packages/auth/src/client.ts

@@ -1,6 +1,25 @@
+import { BetterAuthClientPlugin } from "better-auth";
 import { apiKeyClient, magicLinkClient } from "better-auth/client/plugins";
-import { createAuthClient } from "better-auth/react";
+import { BetterFetchOption, createAuthClient } from "better-auth/react";
+
+import { socialProvidersPlugin } from "./auth";
+
+const socialProvidersPluginClient = {
+  id: "social-providers-plugin",
+  $InferServerPlugin: {} as ReturnType<typeof socialProvidersPlugin>,
+  getActions: ($fetch) => {
+    return {
+      getSocialProviders: async (fetchOptions?: BetterFetchOption) => {
+        const res = $fetch("/social-providers", {
+          method: "GET",
+          ...fetchOptions,
+        });
+        return res.then((res) => res.data as string[]);
+      },
+    };
+  },
+} satisfies BetterAuthClientPlugin;
 
 export const authClient = createAuthClient({
-  plugins: [magicLinkClient(), apiKeyClient()],
+  plugins: [magicLinkClient(), apiKeyClient(), socialProvidersPluginClient],
 });