Simple landing page for dApps section (#221)

* Simple landing page for dApps section

* Add to TOC

* rock-simple diagram

* Use indexers as middlewre

docs/dApps.mdx

@@ -0,0 +1,52 @@
+---
+title: Decentralized applications (dApps)
+authors: Benjamin Pilia, Tim McMackin
+last_update:
+  date: 12 January 2024
+---
+
+import LucidDiagram from '@site/src/components/LucidDiagram';
+
+One of the main features of blockchains is _decentralization_: each transaction is verified by multiple nodes and its validation process does not rely on a single trusted third party.
+Decentralized applications (dApps or Dapps) take advantage of these features to create applications that are independent, transparent, and trustless.
+
+In general, dApps have these parts:
+
+- **Frontend**: An off-chain component that can act as a user interface to simplify interaction with the on-chain component, run off-chain processing, and get information from sources that are not available to the on-chain component
+- **Middleware**: Optionally, an [indexer](./developing/information/indexers) to interpret the backend information and provide it in a more convenient format for the front-end component
+- **Backend**: An on-chain component that consists of one or more [smart contracts](./smart-contracts)
+
+The off-chain component can be nearly any kind of program, including a web application, mobile or desktop app, or command-line interface.
+It relies on wallets and tools to interact with the smart contract on behalf of a user's Tezos account.
+
+<LucidDiagram width="640px" height="480px" src="https://lucid.app/documents/embedded/8caf9ef1-11e4-454a-bbb6-ef4852515959" id=".4NXymECcQqz" />
+
+Some of these tools that allow an off-chain component to interact with smart contracts include:
+
+- [Taquito](./dApps/taquito), an SDK for JavaScript/TypeScript applications
+- The [Tezos SDK for Unity](./unity), a toolkit for Unity applications
+- [Taqueria](https://taqueria.io/), a development platform for dApps
+
+## Sample dApps
+
+For example dApps, see [Sample dApps](./dApps/samples).
+
+## Best practices
+
+Good programming and design practices make dApps easier to use and provide a better user experience.
+See [Best practices and avoiding flaws](./dApps/best-practices).
+
+## dApp tasks
+
+For information on typical tasks that dApps do, see:
+
+- [Connecting to wallets](./dApps/wallets)
+- [Sending transactions](./dApps/sending-transactions)
+
+## Tutorials
+
+These tutorials cover dApps of different complexities:
+
+- For a simple dApp, see [Build your first app on Tezos](./tutorials/build-your-first-app)
+- For a dApp that mints NFTs, see [Mint NFTs from a web app](./tutorials/create-an-nft/nft-web-app)
+- For a large dApp that allows users to buy and sell NFTs, see [Build an NFT marketplace](./tutorials/build-an-nft-marketplace)

sidebars.js

@@ -176,10 +176,10 @@ const sidebars = {
     {
       type: 'category',
       label: 'Decentralized applications (dApps)',
-      // link: { // TODO
-      //   id: 'dApps',
-      //   type: 'doc',
-      // },
+      link: {
+        id: 'dApps',
+        type: 'doc',
+      },
       items: [
         // 'dApps/first-dapp', // TODO
         'dApps/samples',