Enhance ENSDb Docs

[lightwalker-eth]

Next step goals include:

1. Introducing ideas about snapshot capabilities
2. Optimize this example

3. Optimize this example

4. Optimize presentation of schemas

5. Document details of the lifecycle of an ENSIndexer schema and its relationship to its associated metadata in the ENSNode schema.

6. We should also explicitly communicate how ENSDb automatically handles chain reorgs.

[coderabbitai]

⚠️ Possible Duplicate Issue(s)

• Extend ENSDb documentation #1789

🔗 Related PRs

#1613 - feat(ensindexer): introduce Indexing Status Builder module [merged]
#1660 - ENSDb data model [merged]
#1942 - Initial docs for ENSDb [closed]

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[tk-o]

@lightwalker-eth and I discussed keeping the current examples, just for the time being. More details on that here.

[tk-o]

The goals of this issue have been addressed in other PRs. See the updated content:

• https://ensnode.io/docs/services/ensdb#whats-next
• https://ensnode.io/docs/self-host#bootstrap-from-a-snapshot-coming-soon
• https://ensnode.io/docs/integrate/integration-options/ensdb
• https://ensnode.io/docs/integrate/unigraph/examples/domain-by-name