Fix the README.md syntax

Signed-off-by: Michal Konecny <mkonecny@redhat.com>

README.md

@@ -11,27 +11,27 @@ https://fedora-arc.readthedocs.io/en/latest/index.html
 
 1. Create python virtual environment
 
-   ```
-   python3 -m venv .venv
-   ```
+    ```
+    python3 -m venv .venv
+    ```
 
 2. Activate virtual environment
 
-   ```
-   . .venv/bin/activate
-   ```
+    ```
+    . .venv/bin/activate
+    ```
 
 3. Install requirements
 
-   ```
-   pip install -r docs/requirements.txt
-   ```
+    ```
+    pip install -r docs/requirements.txt
+    ```
 
 4. Execute the Makefile
 
-   ```
-   cd docs
-   make html
-   ```
+    ```
+    cd docs
+    make html
+    ```
 
 5. You will find the compiled HTML in `docs/_build/html`