feat(contract-dev): create the overview page

content/contract-dev/overview.mdx

@@ -0,0 +1,51 @@
+---
+title: "Contract development overview"
+sidebarTitle: "Overview"
+---
+
+How to build, test, deploy, and debug TON smart contracts. This section covers the recommended toolchain, editor support, reusable techniques, and the legacy TypeScript environment.
+
+<Callout
+  type="caution"
+  title="The Web IDE is retired"
+>
+  The Web IDE at `ide.ton.org` has been retired and is no longer available. Develop locally with the [Acton toolchain](#toolchain) and one of the [editor plugins](#ides-and-editor-plugins) below.
+</Callout>
+
+## Toolchain
+
+The recommended language for TON smart contracts is [Tolk](/tolk/overview). [Acton ↗️](/contract-dev/acton) is the recommended all-in-one toolchain for the entire contract development lifecycle, including building, testing, and deploying Tolk contracts.
+
+<Callout
+  type="note"
+  title="External documentation"
+>
+  [Acton ↗️](/contract-dev/acton) documentation is hosted and updated externally.
+</Callout>
+
+## IDEs and editor plugins
+
+Add support for the Acton toolchain, Tolk language, and intermediate TON languages to a local editor:
+
+- [VS Code and forks](/contract-dev/ide/vscode) — extension for VS Code, VSCodium, Cursor, Windsurf, and other VS Code-based editors
+- [JetBrains IDEs](/contract-dev/ide/jetbrains) — plugin for IntelliJ IDEA, WebStorm, CLion, PyCharm, and other JetBrains IDEs
+
+## Techniques
+
+Focused how-to guides for common smart contract tasks:
+
+- [Signing and signature verification](/contract-dev/techniques/signing)
+- [Contract sharding](/contract-dev/techniques/contract-sharding)
+- [Security](/contract-dev/techniques/security)
+- [Gas optimization](/contract-dev/techniques/gas)
+- [On-chain jetton processing](/contract-dev/techniques/on-chain-jetton-processing)
+- [Using on-chain libraries](/contract-dev/techniques/using-on-chain-libraries)
+- [Random number generation](/contract-dev/techniques/random)
+- [Contract upgrades](/contract-dev/techniques/upgrades)
+- [Vanity addresses](/contract-dev/techniques/vanity)
+- [Zero-knowledge proofs](/contract-dev/techniques/zero-knowledge)
+- [Groth16 examples](/contract-dev/techniques/groth16-examples)
+
+## Blueprint (legacy)
+
+[Blueprint](/contract-dev/blueprint/overview) is a legacy TypeScript environment that is still supported for older projects.

content/from-ethereum.mdx

@@ -88,7 +88,7 @@ The following table showcases some use cases that existing TON services support.
 | User-friendly explorer                  | Etherscan        | [Tonviewer](https://tonviewer.com/), [Tonscan](https://tonscan.org/) |
 | Open-source dev explorer                | Blockscout       | [TON Explorer](https://explorer.toncoin.org/)                        |
 | Debugger                                | Remix Debugger   | [TxTracer](https://txtracer.ton.org/)                                |
-| IDE                                     | Remix IDE        | [Web IDE](https://ide.ton.org/)                                      |
+| IDE                                     | Remix IDE        | None, use the local [Acton toolchain](/contract-dev/acton)           |
 | Asm playground and compilation explorer | EVM.Codes        | [TxTracer](https://txtracer.ton.org/)                                |
 
 ### Standards

content/languages/tact.mdx

@@ -1,8 +1,7 @@
 ---
-title: "Tact language"
+title: "Tact language (deprecated)"
 sidebarTitle: "Tact"
 noindex: true
-tag: "deprecated"
 ---
 
 <Callout
@@ -24,13 +23,7 @@ Developed by [TON Studio](https://tonstudio.io), powered by the community — at
 
 Tact has undergone a comprehensive security audit by [Trail of Bits](https://www.trailofbits.com), a leading Web3 security firm.
 
-<Columns cols={3}>
-  <Card
-    title="Try it online!"
-    arrow="true"
-    href="https://ide.ton.org/"
-  />
-
+<Columns cols={2}>
   <Card
     title="Tact documentation"
     arrow="true"

docs.json

@@ -479,6 +479,7 @@
       {
         "group": "Contract development",
         "pages": [
+          "contract-dev/overview",
           "contract-dev/acton",
           {
             "group": "IDEs and editor plugins",