Add bio pages part 3

...ons/bioinformatics_tools/de_novo_assembly_tools/_index.md

...ions/bioinformatics_tools/de_novo_assembly_tools/oases.md

...ations/bioinformatics_tools/de_novo_assembly_tools/ray.md

...ioinformatics_tools/de_novo_assembly_tools/soapdenovo2.md

...nformatics_tools/de_novo_assembly_tools/trinity/_index.md

...sembly_tools/trinity/running_trinity_in_multiple_steps.md

...informatics_tools/de_novo_assembly_tools/velvet/_index.md

...embly_tools/velvet/running_velvet_with_paired_end_data.md

...vet/running_velvet_with_single_end_and_paired_end_data.md

...embly_tools/velvet/running_velvet_with_single_end_data.md

static/html/oases.html

static/html/ray.html

static/html/soapdenovo2.html

static/html/trinity.html

static/html/velvet.html