Refine Getting Started Instructions

[lightwalker-eth]

Creating this issue to help accelerate the closure of #20

• Add Postgres to the list of prerequisites.
  • Note that Ponder requires Postgres >= 14.
  • Please see the separate discussion thread below regarding how we handle the database question.
• Extend the getting started narrative to include steps for actually getting value out of the indexer. For example, something in the general direction of the following: https://ponder.sh/docs/getting-started/new-project#query-the-graphql-api
  • How to query the GraphQL API (what route to send requests to, relative to the hostname of the reader's indexer) / any other relevant details on this. Perhaps also link related documentation in Ponder docs.
  • Note that the GraphQL API of our indexer mimics the ENS Subgraph interface to make transitioning from the ENS Subgraph easy.
  • Instructions for how to configure ensjs to make use of our indexer. Please see points 2 and 3 shared in this Slack message: https://namehash.slack.com/archives/C086Z6FNBHN/p1735335513211229

Please consider and suggest other ideas / steps we should consider documenting to help others quickly and successfully get started running their own ENSNode instance.