[INFRA-215] Add a link to github procedure note to repos.html

Thu, 4 Apr 2019 14:30:57 +0000

repos.html says to "request new repositories, file a ticket to INFRA project at PFS JIRA.", but no reference link on how.
we have a guide (required information to add) at github, so we should add a link there.

PFS-JIRA

[INFRA-215] Add a link to github procedure note to repos.html