added gitignore and limited concurrent jobs on hpc

.gitignore

+.config
+.snakemake
+output
+logs
+nohup.out
+container.sif

scripts/slurm-snakemake.sh

 mkdir -p logs
 nohup snakemake $1 \
-    --jobs 99 \
+    --jobs 12 \
     --use-singularity \
     --cluster-config cluster.json \
     --cluster "sbatch -A {cluster.account} -p {cluster.partition} --ntasks {cluster.ntasks} --cpus-per-task {cluster.ncpu} --nodes {cluster.nodes} -t {cluster.time} --job-name {cluster.name} --output {cluster.output} --error {cluster.error}" &