Remove instruction telling to add singularity image path in config.

docs/installation.md

@@ -70,16 +70,6 @@ two files (`metagwgs.sif` and `eggnog_mapper.sif`) must have been downloaded.
 
 At the end of the build, two files (`metagwgs.sif` and `eggnog_mapper.sif`) must have been generated.
 
-**WARNING:** to ensure Nextflow can find the _.sif_ files, we encourage you to change the _nextflow.config_ file in metagWGS to contain these lines:
-```
-process {
-    container = '$SING_IMG_FOLDER/metagwgs.sif'
-    withLabel: EGGNOG {
-        container = '$SING_IMG_FOLDER/eggnog_mapper.sif'
-    }
-}
-```
-Where $SING_IMG_FOLDER leads to the directory where the singularity images are built/downloaded.
 
 ## V. Use metagWGS