📝 Improve documentation

server/.env.sample

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+# For production, the database credentials should be changed
+# here and in the docker-compose file for the postgres container, 
+# but they will work for testing or development
+DATABASE_URL=postgresql://postgres:postgres@localhost:5432/postgres?schema=public
+
+# These credentials are required for fetching substitution plan
+# files from BOLLE. More information on how to get them can be found
+# in the BOLLE parser (./server/parser/bolle.js)
+# (If you are using a different file provider than bolle, you can
+# remove these and add the ones required by your file provider)
+BOLLE_URL=
+BOLLE_USER=
+BOLLE_KEY=
+
+# This password is required for logging into your timetable v2
+# instance. You can leave it empty to disable authentication.
+AUTH_PASSWORD=