feat: add tech stack page [#851]

website/versioned_docs/version-v1.x/tech-stack.md

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+---
+title: MACI Tech Stack
+description: Overview of the MACI codebase and tech stack
+sidebar_label: Tech Stack
+sidebar_position: 2
+---
+
+# MACI Tech Stack
+
+To implement an on-chain, privacy-preserving, voting protocol, the MACI codebase consists of three parts:
+
+1. Circom circuits
+2. Solidity smart contracts
+3. TypeScript libraries
+
+## Circuits
+
+MACI has multiple zk-SNARK circuits that ensure all off-chain computation is completed correctly. The circuits enforce that message processing and vote tallying were correctly executed by the coordinator.
+
+The MACI circuits are released through the [`@maci-circuits`](https://www.npmjs.com/package/maci-circuits) NPM package.
+
+[Learn more about MACI circuits](/docs/circuits)
+
+## Smart contracts
+
+The MACI smart contracts provide the functionality to sign up voters, deploy polls, and they store on-chain data from transactions, such as the encrypted votes of a poll. They also verify proofs of the zk-SNARK circuits.
+
+The MACI contracts are released through the [`@maci-contracts`](https://www.npmjs.com/package/maci-contracts) NPM package.
+
+[Learn more about MACI contracts](/docs/contracts)
+
+## TypeScript libraries
+
+The TypeScript libraries provide a variety of functionality, such as encryption tools, utilities, and a CLI for interacting with MACI (such as vote tallying & proof-generation).
+
+The MACI TS libraries are released through the following NPM packages:
+
+- [`@maci-cli`](https://www.npmjs.com/package/maci-cli)
+- [`@maci-common`](https://www.npmjs.com/package/maci-common)
+- [`@maci-core`](https://www.npmjs.com/package/maci-core)
+- [`@maci-crypto`](https://www.npmjs.com/package/maci-crypto)
+- [`@maci-domainobjs`](https://www.npmjs.com/package/maci-domainobjs)
+- [`@maci-integrationtests`](https://www.npmjs.com/package/maci-integrationtests)
+- [`@maci-server`](https://www.npmjs.com/package/maci-server)