docs: Update v0.34.x to prepare for v0.37 (#9244)

* Ignore generated/copied RPC docs

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* Sync vuepress config with main

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* Sync docs package-lock.json with main

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* Sync docs redirects with main

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* Sync docs versions with main

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* Update OpenAPI version to v0.34

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* Sync DOCS_README with main

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* Update all v0.34.x docs references from master to main

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* Update v0.34 OpenAPI references from master to main

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* Update repo doc links from master to main

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* Update code comment references from master to main

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* Update repo root doc links from master to main

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* Update repo root doc links for docs.tendermint.com from master to main

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* Build v0.34.x as "latest"

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* Explicitly mark v0.34 docs as latest in version selector

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* Add nav link to main and clearly mark as unstable

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* Direct all docs.tendermint.com links to v0.34 on v0.34.x

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* Update all relevant links on v0.34.x branch to be v0.34-specific

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* Update changelog refs to docs.tendermint.com

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* Update remaining GH master link to main

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* Sync docs build and nav config with main

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* Migrate spec links to GitHub repo from docs site

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docs/introduction/what-is-tendermint.md

@@ -120,7 +120,7 @@ consensus engine, and provides a particular application state.
 ## ABCI Overview
 
 The [Application BlockChain Interface
-(ABCI)](https://github.com/tendermint/tendermint/tree/master/abci)
+(ABCI)](https://github.com/tendermint/tendermint/tree/v0.34.x/abci)
 allows for Byzantine Fault Tolerant replication of applications
 written in any programming language.
 
@@ -180,15 +180,15 @@ The application will be responsible for
 - Allowing clients to query the UTXO database.
 
 Tendermint is able to decompose the blockchain design by offering a very
-simple API (ie. the ABCI) between the application process and consensus
+simple API (i.e. the ABCI) between the application process and consensus
 process.
 
 The ABCI consists of 3 primary message types that get delivered from the
 core to the application. The application replies with corresponding
 response messages.
 
-The messages are specified here: [ABCI Message
-Types](https://github.com/tendermint/tendermint/blob/master/abci/README.md#message-types).
+The messages are specified in the [ABCI
+specification](https://github.com/tendermint/tendermint/blob/v0.34.x/spec/abci/abci.md).
 
 The **DeliverTx** message is the work horse of the application. Each
 transaction in the blockchain is delivered with this message. The