feat!: merge signup into login and add oauth

BREAKING CHANGE: This removes the previous signup page. Its
functionality can be accessed from the login one.
Adds login using OAuth with the current providers being Discord and
GitHub.
Requires environment variables to be set for these providers.

README.md

@@ -21,6 +21,7 @@ npm run dev
 ## Hosting
 
 The Fancade Club uses [Netlify](https://netlify.com) and [Neon](https://neon.tech) to provide its services for free. For setting up these or other providers, see [Astro adapters](https://docs.astro.build/en/guides/server-side-rendering/) and [Drizzle setup](https://orm.drizzle.team/docs/get-started).
+Also take a look at [the Astro configuration](./astro.config.mjs) for required environment variables.
 
 ## Disclaimer
 

astro.config.mjs

@@ -5,6 +5,26 @@ export default defineConfig({
   env: {
     schema: {
       DATABASE_URL: envField.string({ context: "server", access: "secret" }),
+      GITHUB_CLIENT_ID: envField.string({
+        context: "server",
+        access: "secret",
+      }),
+      GITHUB_CLIENT_SECRET: envField.string({
+        context: "server",
+        access: "secret",
+      }),
+      DISCORD_CLIENT_ID: envField.string({
+        context: "server",
+        access: "secret",
+      }),
+      DISCORD_CLIENT_SECRET: envField.string({
+        context: "server",
+        access: "secret",
+      }),
+      DISCORD_REDIRECT_URL: envField.string({
+        context: "server",
+        access: "secret",
+      }),
     },
   },
   security: {