Update INSTALL.md
Update INSTALL.md

Cleaned up docs up to and including the whole of section 2
DANS-KNAW/dccd-webui,DANS-KNAW/dccd-webui,DANS-KNAW/dccd-webui,PaulBoon/dccd-webui,petebrew/dccd-webui,petebrew/dccd-webui,PaulBoon/dccd-webui,PaulBoon/dccd-webui,DANS-KNAW/dccd-webui,PaulBoon/dccd-webui,petebrew/dccd-webui,PaulBoon/dccd-webui,petebrew/dccd-webui,petebrew/dccd-webui,DANS-KNAW/dccd-webui