docs: add introduction to Blockchain Indexing

[davd-gzl]

Close: #2295
Depends on: gnolang/tx-indexer#219

Minimal Documentation to introduce Blockchain indexing through tx-indexer.
I've as well made made an introduction video with a GraphQL live coding example : https://www.youtube.com/watch?v=8ld0nsV37SA.

[Gno2D2]

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[n0izn0iz]

I think you should use something else than balance as an example, since for that you can simply query the chain.

I think a good example is building a search tool.

Example, for social content: indexing blog posts and building a full-text-search feature over posts content on top of that, which is something that would cost a huge amount of gas if done on-chain.
Also search for usernames is a good example.

[davd-gzl]

@n0izn0iz I modified the section to add more detailed and relevant example following your feedback! 👍

[leohhhn]

Hey @Davphla, let me know when you are ready for another round of reviews.

[davd-gzl]

I re-open it.
I reworked it since it was not really great before.

I add a full example implementation step by step (i tried it it's all working great, I can upload it in a separate repository).
It's a lot of code in the documentation, but I believe in that specific case that's the most efficient way to share knowledge.
It's quite hard to implement when you don't know anything about it (as I got when writing this documentation).
I'm open to listen any changes and review!

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[leohhhn]

Hey! Thank you so much for working on the docs. I've left a few comments, and I can take a look again soon.

[davd-gzl]

Code available at: https://github.com/samouraiworld/tx-indexer-example (To be moved in Gnoverse).

I've modified through the new update:

• Remove the database part from the documentation. I think is unrelated to the use of the indexer -- Though it is still available through the link above.
• Use of embedmd to extract the code to the _assets folder.
• Use a json structure to match the GraphQL structure

[nemanjantic]

@davd-gzl is this still relevant?

[davd-gzl]

Hi @nemanjantic, this is still relevant, I'm gonna rework the content before asking for a review

[davd-gzl]

Per gnoverse/gnopls#39, I think this doc is too specialized and should be moved entirely on tx-indexer repository.