feat: add configurable edit link position

[davlgd]

Fix #241 (I followed instructions seen in this conversation)

• Add a where parameter to editURL
• Allow user to choose between toc (default) and single
• Add to single through last-updated partial

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[imfing]

did you update the partial?

[davlgd]

Sorry I misunderstood your comment, it should be fixed now

[imfing]

Sorry I misunderstood your comment, it should be fixed now

thanks will take a look