hide src/* files not necessary for users

src/.singularity_modules/bioawk/1.0/bioawk

src/.singularity_modules/bioawk/1.0/bioawk.def

src/.singularity_modules/bioawk/1.0/build.sh

src/.singularity_modules/bowtie/1.2.2/bowtie

src/.singularity_modules/bowtie/1.2.2/bowtie.def

src/.singularity_modules/bowtie/1.2.2/build.sh

src/.singularity_modules/bowtie2/2.3.4.1/bowtie2

src/.singularity_modules/bowtie2/2.3.4.1/bowtie2.def

src/.singularity_modules/bowtie2/2.3.4.1/build.sh

src/.singularity_modules/bwa/0.7.17/build.sh

src/.singularity_modules/bwa/0.7.17/bwa

src/.singularity_modules/bwa/0.7.17/bwa.def

src/.singularity_modules/canu/1.6/build.sh

src/.singularity_modules/canu/1.6/canu

src/.singularity_modules/canu/1.6/canu.def

src/.singularity_modules/cutadapt/1.14/build.sh

src/.singularity_modules/cutadapt/1.14/cutadapt

src/.singularity_modules/cutadapt/1.14/cutadapt.def

src/.singularity_modules/cutadapt/1.15/build.sh

src/.singularity_modules/cutadapt/1.15/cutadapt