Dissolve plan.md into docs/, move open work to Gitea issues

.env.example

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+# Template for the local .env file (which is gitignored and holds real secrets).
+# Copy this to .env and fill in the real values. Never commit .env.
+
+# Gitea access token with scope "issue: Read and Write", used to read and create
+# issues on the Gitea instance. Create it at:
+#   Gitea -> Settings -> Applications -> Access Tokens (name "issue-tracking")
+GITEA_TOKEN=
+
+# Base URL of the Gitea instance and the repo path issues belong to.
+GITEA_URL=https://gitea.anticarnist.de
+GITEA_REPO=Tom/Elternbeirat