Update README.md to move the PSVM link under a "Tooling" section under the...

Update README.md to move the PSVM link under a "Tooling" section under the "Releases" section (#4734)

This update implements the suggestion from @Kianenigma mentioned in
https://github.com/paritytech/polkadot-sdk/pull/4718#issuecomment-2153777367

Replaces the "Other useful resources and tooling" section at the bottom
with a new (nicer) "Tooling" section just under the "Releases" section.

README.md

@@ -50,6 +50,12 @@ non-breaking features on a **two week** cadence.
 `nightly` releases are released every night from the `master` branch, potentially with breaking
 changes. They have pre-release version numbers in the format `major.0.0-nightlyYYMMDD`.
 
+## 🛠️ Tooling
+
+[Polkadot SDK Version Manager](https://github.com/paritytech/psvm):
+A simple tool to manage and update the Polkadot SDK dependencies in any Cargo.toml file.
+It will automatically update the Polkadot SDK dependencies to their correct crates.io version.
+
 ## 🔐 Security
 
 The security policy and procedures can be found in
@@ -81,7 +87,3 @@ fellowship, this separation, the RFC process
 This repository is the amalgamation of 3 separate repositories that used to make up Polkadot SDK,
 namely Substrate, Polkadot and Cumulus. Read more about the merge and its history
 [here](https://polkadot-public.notion.site/Polkadot-SDK-FAQ-fbc4cecc2c46443fb37b9eeec2f0d85f).
-
-## Other useful resources and tooling
-
-* A simple tool to manage and update the Polkadot SDK dependencies (https://github.com/paritytech/psvm)