client: add WELCOME_TITLE and WELCOME_MESSAGE as env vars

client/.env.local

@@ -1 +1,3 @@
 API_URL=http://localhost:3000
+WELCOME_TITLE="Welcome to Drift"
+WELCOME_CONTENT="### Drift is a self-hostable clone of GitHub Gist. \nIt is a simple way to share code and text snippets with your friends, with support for the following:\n  \n  - Render GitHub Extended Markdown (including images)\n  - User authentication\n  - Private, public, and secret posts\n  \n  If you want to signup, you can join at [/signup](/signup) as long as you have a passcode provided by the administrator (which you don\'t need for this demo).\n  **This demo is on a memory-only database, so accounts and pastes can be deleted at any time.**\n  You can find the source code on [GitHub](https://github.com/MaxLeiter/drift).\n  \n  Drift was inspired by [this tweet](https://twitter.com/emilyst/status/1499858264346935297):\n  > What is the absolute closest thing to GitHub Gist that can be self-hosted?\n    In terms of design and functionality. Hosts images and markdown, rendered. Creates links that can be private or public. Uses/requires registration. I have looked at dozens of pastebin-like things."

client/pages/index.tsx

@@ -9,25 +9,11 @@ import Image from 'next/image'
 import ShiftBy from '../components/shift-by'
 
 export function getStaticProps() {
-  const introDoc = `### Drift is a self-hostable clone of GitHub Gist.
+  const introDoc = process.env.WELCOME_CONTENT
-#### It is a simple way to share code and text snippets with your friends, with support for the following:
-  
-  - Render GitHub Extended Markdown (including images)
-  - User authentication
-  - Private, public, and secret posts
-  
-  If you want to signup, you can join at [/signup](/signup) as long as you have a passcode provided by the administrator (which you don't need for this demo).
-  **This demo is on a memory-only database, so accounts and pastes can be deleted at any time.**
-  You can find the source code on [GitHub](https://github.com/MaxLeiter/drift).
-  
-  Drift was inspired by [this tweet](https://twitter.com/emilyst/status/1499858264346935297):
-  > What is the absolute closest thing to GitHub Gist that can be self-hosted?
-    In terms of design and functionality. Hosts images and markdown, rendered. Creates links that can be private or public. Uses/requires registration.
-    I have looked at dozens of pastebin-like things.
-  `
   return {
     props: {
       introContent: introDoc,
+      introTitle: process.env.WELCOME_TITLE,
     }
   }
 }