Remove relative_url_root from path. Fixes #2602

Files and Commits render a 404 when running with relative_url_root.
Improve network graph
Revise projects/new text

The previous text implied projects can only be private. Projects can now be private or public.
Update Markdown example to use username

Update the Markdown example in the Help pages to use username instead of user.
Merge pull request #2715 from cjwprostar/help-fix

Update Markdown example to use username
Merge pull request #2712 from aus/patch-1

Revise projects/new text
Merge pull request #2709 from hiroponz/improve-network-graph-2

Improve network graph
Merge pull request #2706 from jfut/gh-issue-2602

Remove relative_url_root from path. Fixes #2602