docs: fix headings in get started
# Get Started
-- Skill requirements
+## Skill requirements
- Operating system
You can contribute to Elektra to improve the source code, website, documentation, translation etc.
-- Software requirements
+## Software requirements
We need to install some basic tools to run Elektra: cmake, git and essential build tools (make, gcc, and some standard Unix tools; alternatively [ninja](https://ninja-build.org/) and [clang](https://clang.llvm.org/index.html) are also supported but not described here). Depending on your Linux distribution use the following commands to install these tools:
brew install cmake git
```
-- Installation
+## Installation
If you meet all the software requirements you can get the source code of Elektra by using this command:
kdb run_nokdbtests
```
-- Hello World!
+## Hello World!
Start with your very first Elektra application in C and follow these steps:
[Hello World!](/doc/tutorials/hello-elektra.md)
