Made the data folder an envvar

gogs/mirroring_with_gitea.md

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+My gogs repo has started to have quite a bit of interesting info. The gogs
+instance is deployed on a clouding machine, and clouding has proven to be a
+very reliable company so far. But, if they ever have an incident and the data
+is gone, I'm fucked big time.
+
+Recently I deployed gitea instance on a local machine at my place. I realised
+gitea has this pretty neat mirroring function that can keep a syncd copy of
+repos in gogs, so I'm gonna set that up for all the important repos.
+
+For auth purposes, I had to get a personal token tied to my user account in
+gogs. It is:
+
+d3568092375925b7cba556b55c65a684e31ba55f
+
+It needs to be used when setting up the mirrors in gitea so that gitea has the
+right auth.