Fix heading hierarchy in the hardware basics article

content/en/2.general/4.hardware/1.basics.md

@@ -64,7 +64,7 @@ The __GPU__ (Graphics Processing Unit) handles graphical, video, and sometimes A
 
 Depending on the required performance, one can choose between a dedicated GPU with its own VRAM (a graphics card connected to a PCIe slot on the motherboard), or an iGPU, an integrated GPU built into the CPU (such as the N100/N150 or N305/N355), which uses the system’s shared RAM.
 
-### HDD(s)
+## HDD(s)
 
 <p align="center">
   <img src="/img/global/hdd.svg" alt="Image" style="max-width: 50%; margin-right: 20px;">
@@ -82,7 +82,7 @@ Generally, HDDs are best suited for storing data that doesn’t require frequent
 
 Comes in 3.5" and 2.5" formats; servers usually favor the more reliable 3.5".
 
-### SSD(s)
+## SSD(s)
 
 <p align="center">
   <img src="/img/global/nvme.svg" alt="Image" style="max-width: 50%; margin-right: 20px;">
@@ -96,7 +96,7 @@ SSDs come in various formats, but today the preferred choice is the M.2 NVMe ver
 
 However, SSDs are significantly more expensive than hard drives for the same storage capacity. Typically, the operating system (OS) is installed on the SSD to ensure fast performance. In a server environment, it's also ideal to store [Docker containers](/serveex/core/docker) and databases on the SSD. More broadly, any data that needs to be accessed frequently and quickly, such as websites, applications, or processing workloads, should be stored on an SSD.
 
-### Network Card
+## Network Card
 
 A __network card__ allows your machine to communicate with your network (including the internet). It consists of a controller chip and one or more network ports. These ports, often Ethernet ports, can come in different physical formats and support various data transfer standards:
 
@@ -116,7 +116,7 @@ The network card is usually built directly into the motherboard, but you can als
 
 In general, for a server setup, it's recommended to have at least two Ethernet ports to ensure redundancy in case one connection fails.
 
-### Input/Output Ports
+## Input/Output Ports
 
 __I/O__ ports allow communication with external devices (displays, keyboard, mouse, network...). Motherboards typically offer:
 
@@ -127,7 +127,7 @@ __I/O__ ports allow communication with external devices (displays, keyboard, mou
 
 Choose a motherboard and expansions based on your I/O needs.
 
-### Power Supply
+## Power Supply
 
 The __power supply unit__ (PSU) is the component that provides electrical power to your machine’s components. It connects to the wall via a power cord and has several output cables that plug into the motherboard and various peripherals, such as hard drives or dedicated graphics cards.
 
@@ -141,7 +141,7 @@ Another important factor is the form factor. There are several standard sizes, f
 
 To choose the right PSU, a common rule of thumb is to estimate your system’s power needs based on usage, and then double that value. This is because most power supplies operate at optimal efficiency around 50% of their maximum load.
 
-### Case
+## Case
 
 <div style="display: flex; align-items: center;">
   <img src="/img/global/case.svg" alt="Image" style="max-width: 25%; max-height:230px; margin-right: 20px;">