feat: Update config.ini with consistent indentation

This commit updates the config.ini file to have consistent indentation for the particle properties. The indentation has been adjusted to align the properties properly, improving the readability of the file.

Author: Gianuzzi

config.ini

@@ -48,12 +48,12 @@ c  5.d-2          2.5d0            180.0d0
 <> Particles (single and/or particles file) -
 
    use single particle (yes / no)              : no
-   mass of particle (kg)                       : 0.d0
-   semi-major axis of particle (km)            : 0.d0
-   eccentricity of particle                    : 0.d0
-   mean anomaly of particle (deg)              : 0.d0
-   pericenter longitude of particle (deg)      : 0.d0
-   mean motion ratio of particle (to spin)     : 0.d0
+    mass of particle (kg)                      : 0.d0
+    semi-major axis of particle (km)           : 0.d0
+    eccentricity of particle                   : 0.d0
+    mean anomaly of particle (deg)             : 0.d0
+    pericenter longitude of particle (deg)     : 0.d0
+    mean motion ratio of particle (to spin)    : 0.d0
 
    particles input file (name / no)            : no