Update mentions of genome preparation workflow.

Also made the genome preparation repository a submodule.

.gitmodules

@@ -34,3 +34,6 @@
 	path = bam25prime
 	url = https://bioinfo_utils:UTSWyWVPdw_kbxWR7-zD@gitlab.pasteur.fr/bli/bam25prime.git
 	update = merge
+[submodule "genome_preparation"]
+	path = genome_preparation
+	url = git@gitlab.pasteur.fr:bli/genome_preparation.git

README.md

@@ -95,7 +95,7 @@ same way as described in the previous section.
 ### Genome preparation
 
 A genome preparation workflow is available at
-<https://gitlab.pasteur.fr/bli/10825_Cecere/-/tree/master/Genomes>
+<https://gitlab.pasteur.fr/bli/genome_preparation>
 
 This workflow will download genomic data from Illumina's iGenomes repository as
 well as data regarding repeated elements directly from UCSC.

genome_preparation @ ad8d2cd7

+Subproject commit ad8d2cd7ce865ccc5ce4ee8a8d35813d7de702cc