chore: Add ability to import .graphql files

Change next-js config to be able to write

```
import typeDefs from './schema.graphql'
```

web/@types/graphql.d.ts

@@ -0,0 +1,6 @@
+declare module '*.graphql' {
+  import { DocumentNode } from 'graphql'
+  const Schema: DocumentNode
+
+  export = Schema
+}

web/next.config.js

@@ -2,6 +2,17 @@ const API_DOCS_URL = 'https://docs.manifold.markets/api'
 
 /** @type {import('next').NextConfig} */
 module.exports = {
+  webpack: (config) => {
+    config.module.rules.push({
+      test: /\.(graphql|gql)$/,
+      exclude: /node_modules/,
+      loader: 'graphql-tag/loader',
+    })
+    return config
+  },
+  webpackDevMiddleware: (config) => {
+    return config
+  },
   staticPageGenerationTimeout: 600, // e.g. stats page
   reactStrictMode: true,
   optimizeFonts: false,

web/package.json

@@ -36,6 +36,7 @@
     "daisyui": "1.16.4",
     "dayjs": "1.10.7",
     "firebase": "9.6.0",
+    "graphql": "16.5.0",
     "gridjs": "5.0.2",
     "gridjs-react": "5.0.2",
     "lodash": "4.17.21",

yarn.lock

@@ -6602,6 +6602,11 @@ graceful-fs@^4.1.2, graceful-fs@^4.1.6, graceful-fs@^4.2.0, graceful-fs@^4.2.4,
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.10.tgz#147d3a006da4ca3ce14728c7aefc287c367d7a6c"
   integrity sha512-9ByhssR2fPVsNZj478qUUbKfmL0+t5BDVyjShtyZZLiK7ZDAArFFfopyOTj0M05wE2tJPisA4iTnnXl2YoPvOA==
 
+graphql@16.5.0:
+  version "16.5.0"
+  resolved "https://registry.yarnpkg.com/graphql/-/graphql-16.5.0.tgz#41b5c1182eaac7f3d47164fb247f61e4dfb69c85"
+  integrity sha512-qbHgh8Ix+j/qY+a/ZcJnFQ+j8ezakqPiHwPiZhV/3PgGlgf96QMBB5/f2rkiC9sgLoy/xvT6TSiaf2nTHJh5iA==
+
 gray-matter@^4.0.3:
   version "4.0.3"
   resolved "https://registry.yarnpkg.com/gray-matter/-/gray-matter-4.0.3.tgz#e893c064825de73ea1f5f7d88c7a9f7274288798"