feat: add Nextjs SSR example (#49)

* feat: add nextjs ssr example

* feat: upgrade to PKCE

* fix: cleanup DS_Store

* feat: upgrade store to global store

* feat: update store type declaration

examples/nextjs-ssr/.env.example

@@ -0,0 +1,3 @@
+SGID_CLIENT_ID=
+SGID_CLIENT_SECRET=
+SGID_PRIVATE_KEY=

examples/nextjs-ssr/.eslintrc.json

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+{
+  "extends": "next/core-web-vitals"
+}

examples/nextjs-ssr/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# local env files
+.env*.local
+.env
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts

examples/nextjs-ssr/README.md

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+# sgID Next.js (SSR) Example
+
+This is a [Next.js](https://nextjs.org/) project bootstrapped with [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app).
+
+## Getting Started
+
+Before you can run the development server, you will have to register your client on the sgID [developer portal](https://developer.id.gov.sg/).
+
+- For this example, you will need to include the following scopes `[openid, myinfo.name]` and register the following redirect URL `http://localhost:3000/success`
+
+> For more information about sgID, please visit the [developer documentation](https://docs.id.gov.sg/).
+
+Copy the `.env.example` file, rename it to `.env`, and fill in your credentials obtained during registration.
+
+Then, run the development server by running:
+
+```bash
+npm run dev
+```
+
+Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.

examples/nextjs-ssr/next-env.d.ts

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+/// <reference types="next" />
+/// <reference types="next/image-types/global" />
+
+// NOTE: This file should not be edited
+// see https://nextjs.org/docs/basic-features/typescript for more information.

examples/nextjs-ssr/next.config.js

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+/** @type {import('next').NextConfig} */
+const nextConfig = {};
+
+module.exports = nextConfig;