docs: Update node buying guide with official vendor and simplified content

docs/farming/buy-node.md

@@ -18,16 +18,13 @@ You have two main paths to becoming a ThreeFold farmer: buying a pre-configured
 
 ### Where to Buy
 
-Several vendors offer certified ThreeFold nodes:
-
 <div className="info-box">
 
-**📦 Node Vendors**
+### 📦 Official Node Vendor
 
-Check the official ThreeFold channels for current list of certified node providers:
+Purchase certified ThreeFold nodes from [YourData Network](https://yourdata.network/product-category/nodes/) - pre-configured, tested, and ready to farm.
-- [ThreeFold Shop](https://threefold.io) - Official vendor listings
+
-- [Telegram Community](https://t.me/threefold/1) - Vendor recommendations
+**Need recommendations?** Join the [Telegram Farmers Community](https://t.me/threefoldfarmers).
-- [Forum Marketplace](https://forum.threefold.io) - Community sales
 
 </div>
 
@@ -38,24 +35,23 @@ When buying a pre-built node, consider:
 - **Capacity Size** - Storage, RAM, and CPU cores
 - **Power Efficiency** - Lower electricity costs
 - **Warranty & Support** - Vendor backing
-- **Price vs. ROI** - Balance cost with earning potential
 - **Shipping & Import Fees** - Total landed cost
 
 ### Typical Node Configurations
 
-**Entry Level (~$500-1000)**
+**Entry Level**
 - 4-8 CPU cores
 - 16GB RAM
 - 500GB-1TB SSD
 - Low power consumption (~50W)
 
-**Mid Range (~$1000-2500)**
+**Mid Range**
 - 8-16 CPU cores
 - 32-64GB RAM
 - 1-2TB SSD
 - Balanced performance (~100W)
 
-**High Performance (~$2500+)**
+**High Performance**
 - 16+ CPU cores
 - 64-128GB+ RAM
 - 2TB+ SSD (multi-drive)
@@ -72,26 +68,14 @@ When buying a pre-built node, consider:
 
 ### Hardware Requirements
 
-**Minimum Configuration:**
+| Component | Minimum | Recommended |
-```
+|-----------|---------|-------------|
-CPU:     Any 64-bit processor (Intel/AMD)
+| **CPU** | Any 64-bit processor (Intel/AMD)<br/>Multi-core recommended (4+ cores) | Modern multi-core processor (8+ cores) |
-         Multi-core recommended (4+ cores)
+| **RAM** | 8GB minimum (16GB+ recommended) | 32GB+ for better capacity utilization |
-RAM:     8GB minimum (16GB+ recommended)
+| **Storage** | 500GB SSD minimum (1TB+ recommended)<br/>Additional HDDs for more capacity | 1TB+ NVMe SSD for high-performance<br/>Additional SSDs or HDDs for capacity |
-Storage: 500GB SSD minimum (1TB+ recommended)
+| **Network** | Gigabit Ethernet (wired connection) | Gigabit Ethernet (1Gbps+) |
-         Additional HDDs for more capacity
+| **Boot** | USB drive (16GB+) for Zero-OS | USB drive (16GB+) for Zero-OS |
-Network: Gigabit Ethernet (wired connection)
+| **Power** | Standard PSU | Efficient PSU (80+ certified) |
-Boot:    USB drive (16GB+) for Zero-OS
-```
-
-**Recommended Configuration:**
-```
-CPU:     Modern multi-core processor (8+ cores)
-RAM:     32GB+ for better capacity utilization
-Storage: 1TB+ NVMe SSD for high-performance
-         Additional SSDs or HDDs for capacity
-Network: Gigabit Ethernet (1Gbps+)
-Power:   Efficient PSU (80+ certified)
-```
 
 ### Compatible Hardware
 
@@ -114,14 +98,14 @@ Power:   Efficient PSU (80+ certified)
 
 - **Repurpose** - Old servers or workstations
 - **Consumer Market** - Build from PC components
-- **Used Enterprise** - eBay, server resellers
+- **Used Enterprise** - Online marketplaces, server resellers
 - **Local Dealers** - Computer hardware stores
 
 <div className="info-box">
 
 ### 💡 Pro Tip
 
-Old enterprise servers (Dell PowerEdge, HP ProLiant) can make excellent farming nodes at low cost. Check eBay and local liquidators.
+Start with one node to learn the system before scaling up. Power efficiency matters more than raw performance - a modern low-power node often earns more than an older high-power one due to electricity costs.
 
 </div>
 
@@ -132,7 +116,7 @@ Old enterprise servers (Dell PowerEdge, HP ProLiant) can make excellent farming
 | Item | Pre-Built | DIY |
 |------|-----------|-----|
 | Hardware | $500-3000+ | $200-2000+ |
-| Setup Time | 1-2 hours | 2-8 hours |
+| Setup Time | 30 min - 1 hour | 2-6 hours |
 | Technical Skill | Minimal | Moderate |
 | Support | Vendor | Community |
 
@@ -141,9 +125,9 @@ Old enterprise servers (Dell PowerEdge, HP ProLiant) can make excellent farming
 **Monthly expenses to factor in:**
 
 - ⚡ **Electricity** - Varies by location and node size
-  - Small node (~50W): $5-15/month
+  - Efficient mini PC (~20W): $1-3/month
-  - Medium node (~100W): $10-30/month
+  - Standard desktop (~75W): $5-15/month
-  - Large node (~200W): $20-60/month
+  - High-performance (~150W): $10-30/month
 
 - 🌐 **Internet** - Usually existing connection
   - Recommend dedicated connection for serious farming
@@ -179,5 +163,5 @@ Once you have your hardware (or know what you'll buy), move on to:
 
 :::tip Need Help Deciding?
 
-Ask the community! The [ThreeFold Telegram](https://t.me/threefold/1) has experienced farmers who can help you choose the right option for your situation.
+Ask the community! The [ThreeFold Telegram](https://t.me/threefoldfarmers) has experienced farmers who can help you choose the right option for your situation.
 :::