fix: revert changes of version in migration docs and remove ethereum tutorials because moved to docs.

Author: Daanvdplas

docs/faq/migrating-from-ink-3-to-4.md

@@ -22,7 +22,7 @@ layout) changes from ink! 3.x to 4.0.
 
 ink! 4.0 is compatible with:
 
-- Stable Rust >= 1.90
+- Stable Rust >= 1.63.0
 - `scale` >=3
 - `scale-info` >= 2.3
 - `pallet-contracts` >= `polkadot-v0.9.37`
@@ -56,7 +56,7 @@ process.
 
 ink! 4.0 and `cargo-contract` use `stable` Rust now.
 This means no more `cargo +nightly contract` is required, you
-can just use a stable Rust toolchain now (>= Rust 1.90).
+can just use a stable Rust toolchain now (>= Rust 1.63).
 
 ## New entrance `ink` crate
 

docs/faq/migrating-from-ink-4-to-5.md

@@ -141,7 +141,7 @@ ensure that this version is enforced, otherwise users will get an error.
 
 ### Tooling & Libraries
 
-- Stable Rust >= 1.90
+- Stable Rust >= 1.75
 - `cargo-contract` >= v4.0
 - `polkadot-js/api` and `polkadot-js/api-contract` >= 10.12.1
 - [`use-inkathon`](https://github.com/scio-labs/use-inkathon): upgrade the `polkadot-js/api` and `polkadot-js/api-contract` dependencies in your project to >= 10.12.1

docs/intro/overview.md

@@ -8,7 +8,7 @@ slug: /solidity-interop/calling-solidity-contracts
 
 # Calling Solidity Contracts
 
-ink! v6 contracts can call Solidity ABI-encoded contracts, enabling seamless interoperability between ink!, Solidity, and other Solidity ABI-compatible contracts. This allows you to integrate with existing Ethereum-compatible smart contracts deployed on Polkadot networks.
+ink! v6 contracts can call Solidity ABI-encoded contracts, enabling seamless interoperability between ink!, Solidity, and other Solidity ABI-compatible contracts. This allows you to integrate with existing Ethereum-compatible smart contracts deployed on Polkadot.
 
 There are two main approaches to calling Solidity contracts from ink!:
 1. **Contract References** (`ContractRef`) - High-level, type-safe interfaces

docs/solidity-interop/calling-solidity-contracts.md

@@ -4,6 +4,9 @@ hide_title: true
 slug: /solidity-interop/use-ink-with-solidity-abi
 ---
 
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+
 ![Use Solidity tooling](/img/title/solidity.svg)
 
 # Use ink! with Solidity ABI
@@ -23,10 +26,20 @@ By enabling Solidity ABI compatibility, you can:
 
 ### 1. Create Your Contract
 
-```bash
-cargo contract new my_contract
-cd my_contract
-```
+<Tabs>
+  <TabItem value="pop" label="Pop" default>
+    ```bash
+    pop new contract my_contract -t standard
+    cd my_contract
+    ```
+  </TabItem>
+  <TabItem value="cargo-contract" label="cargo-contract">
+    ```bash
+    cargo contract new my_contract
+    cd my_contract
+    ```
+  </TabItem>
+</Tabs>
 
 ### 2. Enable Solidity ABI
 
@@ -39,9 +52,18 @@ abi = "sol"
 
 ### 3. Build with Solidity Metadata
 
-```bash
-cargo contract build --release --metadata solidity
-```
+<Tabs>
+  <TabItem value="pop" label="Pop" default>
+    ```bash
+    pop build --release --metadata solidity
+    ```
+  </TabItem>
+  <TabItem value="cargo-contract" label="cargo-contract">
+    ```bash
+    cargo contract build --release --metadata solidity
+    ```
+  </TabItem>
+</Tabs>
 
 This generates Solidity-compatible artifacts in `target/ink/`:
 - `*.abi` - Solidity ABI file for contract interaction

docs/solidity-interop/use-ink-with-solidity-abi.md

@@ -8,14 +8,6 @@ module.exports = {
         'frontend-development/inkathon-erc20',
       ],
     },
-    {
-      type: 'category',
-      label: 'Ethereum Compatibility',
-      items: [
-        'ethereum-compatibility/overview',
-        'ethereum-compatibility/setup-solidity-abi',
-      ],
-    },
     {
       type: 'category',
       label: 'Contribute',