docs: add docs boilerplate (#22202)

(cherry picked from commit e6a719c)

docs/build/_category_.json

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+{
+    "label": "Build",
+    "position": 0,
+    "link": null
+}

docs/build/build.md

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+---
+sidebar_position: 0
+---
+
+# Build
+
+* [Building Apps](./building-apps/00-app-go.md) - The documentation in this section will guide you through the process of developing your dApp using the Cosmos SDK framework.
+* [Modules](./modules/README.md) - Information about the various modules available in the Cosmos SDK: Auth, Authz, Bank, Crisis, Distribution, Evidence, Feegrant, Governance, Mint, Params, Slashing, Staking, Upgrade, NFT, Consensus, Circuit, Genutil.
+* [Migrations](./migrations/01-intro.md) - See what has been updated in each release the process of the transition between versions.
+* [Packages](./packages/README.md) - Explore a curated collection of pre-built modules and functionalities, streamlining the development process.
+* [Tooling](./tooling/README.md) - A suite of utilities designed to enhance the development workflow, optimizing the efficiency of Cosmos SDK-based projects.
+* [ADR's](./architecture/README.md) - Provides a structured repository of key decisions made during the development process, which have been documented and offers rationale behind key decisions being made.
+* [REST API](https://docs.cosmos.network/api) - A comprehensive reference for the application programming interfaces (APIs) provided by the SDK.