update index page
update index page

sheffield-bioinformatics-core/sheffield-bioinformatics-core.github.io,sheffield-bioinformatics-core/sheffield-bioinformatics-core.github.io,sheffield-bioinformatics-core/sheffield-bioinformatics-core.github.io,sheffield-bioinformatics-core/sheffield-bioinformatics-core.github.io