include more external links and resources (#5758)

Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

README.md

@@ -19,6 +19,7 @@ forks](https://img.shields.io/github/forks/paritytech/polkadot-sdk)
 
 ## ⚡ Quickstart
 If you want to get an example node running quickly you can execute the following getting started script:
+
 ```
 curl --proto '=https' --tlsv1.2 -sSf https://raw.githubusercontent.com/paritytech/polkadot-sdk/master/scripts/getting-started.sh | bash
 ```
@@ -31,9 +32,8 @@ curl --proto '=https' --tlsv1.2 -sSf https://raw.githubusercontent.com/paritytec
   * [Guides](https://paritytech.github.io/polkadot-sdk/master/polkadot_sdk_docs/guides/index.html),
 	namely how to build your first FRAME pallet
   * [Templates](https://paritytech.github.io/polkadot-sdk/master/polkadot_sdk_docs/polkadot_sdk/templates/index.html)
-    for starting a new project
-* Other resources:
-  * [Polkadot Wiki -> Build](https://wiki.polkadot.network/docs/build-guide)
+    for starting a new project.
+  * [External Resources](https://paritytech.github.io/polkadot-sdk/master/polkadot_sdk_docs/external_resources/index.html)
 
 ## 🚀 Releases
 

docs/mermaid/IA.mmd

 flowchart
     parity[paritytech.github.io] --> devhub[polkadot_sdk_docs]
-	polkadot_network[polkadot.network] --> devhub[polkadot_sdk_docs]
 
     devhub --> polkadot_sdk
     devhub --> reference_docs
     devhub --> guides
+	devhub --> external_resources
 
     polkadot_sdk --> substrate
     polkadot_sdk --> frame
-    polkadot_sdk --> cumulus
     polkadot_sdk --> polkadot[polkadot node]
     polkadot_sdk --> xcm
+	polkadot_sdk --> templates

docs/sdk/src/external_resources.rs

+//! # External Resources
+//!
+//! A non-exhaustive, un-opinionated list of external resources about Polkadot SDK.
+//!
+//! Unlike [`crate::guides`], or [`crate::polkadot_sdk::templates`] that contain material directly
+//! maintained in the `polkadot-sdk` repository, the list of resources here are maintained by
+//! third-parties, and are therefore subject to more variability. Any further resources may be added
+//! by opening a pull request to the `polkadot-sdk` repository.
+//!
+//! - [Polkadot NFT Marketplace Tutorial by Polkadot Fellow Shawn Tabrizi](https://www.shawntabrizi.com/substrate-collectables-workshop/)
+//! - [DOT Code School](https://dotcodeschool.com/)
+//! - [Polkadot Developers](https://github.com/polkadot-developers/)
+//! - [Polkadot Blockchain Academy](https://github.com/Polkadot-Blockchain-Academy)
+//! - [Polkadot Wiki: Build](https://wiki.polkadot.network/docs/build-guide)

docs/sdk/src/lib.rs

@@ -5,9 +5,6 @@
 //! This crate is a *minimal*, but *always-accurate* source of information for those wishing to
 //! build on the Polkadot SDK.
 //!
-//! > **Work in Progress**: This crate is under heavy development. Expect content to be moved and
-//! > changed. Do not use links to this crate yet. See [`meta_contributing`] for more information.
-//!
 //! ## Getting Started
 //!
 //! We suggest the following reading sequence:
@@ -35,9 +32,13 @@
 /// how one can contribute to it.
 pub mod meta_contributing;
 
+/// A list of external resources and learning material about Polkadot SDK.
+pub mod external_resources;
+
 /// In-depth guides about the most common components of the Polkadot SDK. They are slightly more
 /// high level and broad than [`reference_docs`].
 pub mod guides;
+
 /// An introduction to the Polkadot SDK. Read this module to learn about the structure of the SDK,
 /// the tools that are provided as a part of it, and to gain a high level understanding of each.
 pub mod polkadot_sdk;

docs/sdk/src/polkadot_sdk/mod.rs

@@ -106,9 +106,10 @@
 //! A list of projects and tools in the blockchain ecosystem that one way or another use parts of
 //! the Polkadot SDK:
 //!
-//! * [Polygon's spin-off, Avail](https://github.com/availproject/avail)
+//! * [Avail](https://github.com/availproject/avail)
 //! * [Cardano Partner Chains](https://iohk.io/en/blog/posts/2023/11/03/partner-chains-are-coming-to-cardano/)
 //! * [Starknet's Madara Sequencer](https://github.com/keep-starknet-strange/madara)
+//! * [Polymesh](https://polymesh.network/)
 //!
 //! [`substrate`]: crate::polkadot_sdk::substrate
 //! [`frame`]: crate::polkadot_sdk::frame_runtime