fix: improve middleware docs and remove non existing sdk api's (#378)

## Summary by Sourcery

Refactor documentation by introducing reusable snippets for middleware
instructions, standardizing the term "Smart contract portal", and
removing potentially destructive `delete` operations from code examples.

Documentation:
- Create reusable snippets for creating and managing middleware.
- Update documentation guides (EVM, Hedera) and component pages to use
the new middleware snippets.
- Standardize terminology by renaming "API Portal" to "Smart contract
portal" throughout the documentation.
- Remove potentially unsafe `delete` command examples for various
platform components (networks, storage, smart contract sets,
middleware).
- Correct the SDK documentation link in the release notes.
- Improve formatting with consistent line breaks and code block language
identifiers.

Author: janb87

content/docs/blockchain-and-ai/open-ai-nodes-and-pg-vector.mdx

@@ -11,7 +11,7 @@ This guide will demonstrate how to use the **SettleMint Integration Studio** to
 create a flow that incorporates OpenAI nodes for vectorization and utilizes the
 `pgvector` plugin in Hasura for similarity searches. If you are new to
 SettleMint, check out the
-[Getting Started Guide](/launching-the-platform/managed-cloud-deployment/quickstart).
+[Getting Started Guide](/building-with-settlemint/getting-started).
 
 In this guide, you will learn to create workflows that:
 
@@ -208,4 +208,4 @@ For further resources, check out:
 ---
 
 This guide should enable you to build AI-powered workflows with SettleMint's new
-OpenAI nodes and `pgvector` support in Hasura for efficient similarity searches.
+OpenAI nodes and `pgvector` support in Hasura for efficient similarity searches.

content/docs/building-with-settlemint/evm-chains-guide/add-network-and-nodes.mdx

@@ -157,11 +157,6 @@ You can perform the same action via the SettleMint SDK CLI as well -
       console.log('Network details:', network);
     };
 
-    // Delete network
-    const deleteNetwork = async () => {
-      await client.blockchainNetwork.delete("network-unique-name");
-    };
-
     // Restart network
     const restartNetwork = async () => {
       await client.blockchainNetwork.restart("network-unique-name");
@@ -204,9 +199,6 @@ Network management can be done via SettleMint SDK CLI using these commands -
     # Get network details
     settlemint platform read blockchain-network <network-name>
 
-    # Delete network
-    settlemint platform delete blockchain-network <network-name>
-
     # Restart network
     settlemint platform restart blockchain-network <network-name>
     ```
@@ -230,9 +222,6 @@ Network management can be done via SettleMint SDK CLI using these commands -
     // Get network details
     await client.blockchainNetwork.read("network-unique-name");
 
-    // Delete network
-    await client.blockchainNetwork.delete("network-unique-name");
-
     // Restart network
     await client.blockchainNetwork.restart("network-unique-name");
     ```
@@ -418,11 +407,11 @@ network.
 
 <br></br>
 <div style={{
-  backgroundColor: "#D1E5E8", 
-  color: "#000000", 
+  backgroundColor: "#D1E5E8",
+  color: "#000000",
   padding: "0.5px 10px 10px 10px",
-  borderRadius: "10px", 
-  fontSize: "18px", 
+  borderRadius: "10px",
+  fontSize: "18px",
   fontWeight: "light",
   lineHeight: "1.5",
   textAlign: "left"

content/docs/building-with-settlemint/evm-chains-guide/add-private-keys.mdx

@@ -87,7 +87,7 @@ private key, ECDSA P256, HD ECDSA P256, or HSM ECDSA P256.
     4. Click **confirm** to create the key
 
   </Tab>
-  
+
   <Tab value="SDK CLI">
     ```bash
     # Create Accessible ECDSA P256 key
@@ -105,7 +105,7 @@ private key, ECDSA P256, HD ECDSA P256, or HSM ECDSA P256.
     ```
 
   </Tab>
-  
+
   <Tab value="SDK JS">
     ```typescript
     import { createSettleMintClient } from '@settlemint/sdk-js';
@@ -187,7 +187,7 @@ transaction.
        - Check balances
        - Fund the key
   </Tab>
-  
+
   <Tab value="SDK CLI">
     ```bash
     # List all private keys
@@ -201,7 +201,7 @@ transaction.
     ```
 
   </Tab>
-  
+
   <Tab value="SDK JS">
     ```typescript
     // List private keys
@@ -250,7 +250,7 @@ also simplifies wallet recovery since all wallets are derived from a single
 master key. User wallets use the same signing proxy to sign transactions with
 the corresponding user private key.
 
-## Create and set up user wallets
+## Create and setup user wallets
 
 To set up your user wallets, navigate to your application, click **private
 keys** in the left navigation, and then click **create a private key**. This
@@ -273,7 +273,7 @@ entire tree of ECDSA key pairs in a structured and repeatable way. This system
 follows the BIP-32 standard and includes concepts like key derivation paths and
 chain codes.
 
-<br></br>
+<br />
 The reason HD wallets are suitable for managing wallets is that they support
 deterministic key generation. You can recreate the full wallet from just the
 seed phrase. Each new account or address is simply a derived key from a known
@@ -295,15 +295,13 @@ Remember that for networks that require gas to perform a transaction, the user
 wallet should contain enough funds to cover the gas price. You can fund it using
 the address displayed in the list.
 
-<br></br>
-
-<br></br>
+<br /><br />
 <div style={{
-  backgroundColor: "#D1E5E8", 
-  color: "#000000", 
+  backgroundColor: "#D1E5E8",
+  color: "#000000",
   padding: "0.5px 10px 10px 10px",
-  borderRadius: "10px", 
-  fontSize: "18px", 
+  borderRadius: "10px",
+  fontSize: "18px",
   fontWeight: "light",
   lineHeight: "1.5",
   textAlign: "left"