Fix webmentions not fetching
Fix webmentions not fetching

I guarded webmention fetching so they wouldn't happen during local
development, but unintentionally broke production webmention fetching.

This is because go lang templates scopes variables only to the end of
the containing control structure's `{{ end }}`.

Go 1.11 seemingly introduced a way around this with the `=` re-assignment
operator (vs `:=` assignment/variable definition operator), according to
https://stackoverflow.com/questions/33027070/variables-inside-templates-in-golang

Hoping this works.

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