Update readme

Author: kern

README.md

@@ -6,7 +6,7 @@
 
 ## Usage
 
-A hosted instance is available at [api.cleargraph.com](https://api.cleargraph.com).
+A hosted instance is available at [cleargraph.kern.io](https://cleargraph.kern.io).
 
 ```sh
 git clone [email protected]:dsys/cleargraph.git

database/prisma.yml

@@ -21,4 +21,4 @@ seed:
 # If specified, the `secret` must be used to generate a JWT which is attached
 # to the `Authorization` header of HTTP requests made against the Prisma API.
 # Info: https://www.prisma.io/docs/reference/prisma-api/concepts-utee3eiquo#authentication
-# secret: ${env:PRISMA_SECRET}
+secret: ${env:PRISMA_SECRET}

database/seed.graphql

@@ -13,8 +13,8 @@ export function createContext(req): Context {
   return {
     db: new Prisma({
       debug: true, // log all GraphQL queries & mutations sent to the Prisma API
-      endpoint: process.env.PRISMA_ENDPOINT // the endpoint of the Prisma API (value set in `.env`)
-      // secret: process.env.PRISMA_SECRET, // only needed if specified in `database/prisma.yml` (value set in `.env`)
+      endpoint: process.env.PRISMA_ENDPOINT, // the endpoint of the Prisma API (value set in `.env`)
+      secret: process.env.PRISMA_SECRET // only needed if specified in `database/prisma.yml` (value set in `.env`)
     }),
     loaders: { web3: createWeb3Loaders() },
     req