SelfService: Add page source edit and issue links param

[nginx-jack]

Proposed changes

SelfService: Add page source edit and issue links param. This param is required to generate view/edit/issue links. See related theme update nginxinc/nginx-hugo-theme#216

Closes 328

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Footnotes

1. Potentially sensitive changes include anything involving code, personally identify information (PII), live URLs or significant amounts of new or revised documentation. Please refer to our style guide for guidance about placeholder content. ↩

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[mjang]

Oh... is that all that's necessary in the config.toml file!