clean up old README

CONTRIBUTING.md

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+# Developers
+
+The [`supabase/dbdev`](https://github.com/supabase/dbdev) repository hosts the source code for both the database.dev package registry and its accompanying website. It also hosts the work-in-progress CLI for authors manage their packages.
+
+### Package Registry
+
+The package registry `supabase/`, is a [Supabase](https://supabase.com) project where accounts, organizations, and packages are normalized into database tables. For more info of the registry, see the [architecture](#architecture) section
+
+Requires:
+- [Supabase CLI](https://github.com/supabase/cli)
+- [docker](https://www.docker.com/)
+
+```
+supabase start
+```
+
+which returns a set of endpoints for each service
+
+```text
+supabase local development setup is running.
+
+         API URL: http://localhost:54321
+     GraphQL URL: http://localhost:54321/graphql/v1
+          DB URL: postgresql://postgres:postgres@localhost:54322/postgres
+      Studio URL: http://localhost:54323
+    Inbucket URL: http://localhost:54324
+      JWT secret: SECRET
+        anon key: KEY
+service_role key: KEY
+```
+
+The *API URL* and *anon key* values will be used in the next section to setup environment variables.
+
+
+### Website (database.dev)
+
+The website/ directory contains a Next.js project, which serves as the visual interface for users to interact with the registry.
+
+Requires:
+- [node 14+](https://nodejs.org/en)
+
+Copy `.env.example` file to `.env.local`:
+
+```
+cp .env.example .env.local
+```
+
+Edit the `.env.local` file with your favourite text editor to set the environment variables `NEXT_PUBLIC_SUPABASE_URL` and `NEXT_PUBLIC_SUPABASE_ANON_KEY`:
+
+```
+NEXT_PUBLIC_SUPABASE_URL="<Value of API URL>"
+NEXT_PUBLIC_SUPABASE_ANON_KEY="<Value of anon key>"
+```
+
+Start the development environment:
+
+```
+cd website
+npm install
+npm run dev
+```
+
+Navigate to [http://localhost:3000](http://localhost:3000)
+
+
+### Architecture
+
+- The core tables are located in the `app` schema.
+- The public API is located in the `public` schema.
+
+![ERD](assets/erd.png)