Remove the Staeffelsberg scan grid from the repo

A tower's scan grid belongs to that tower, not to the repo: the copy here
had already drifted from the one Staeffelsberg actually uses.

Before the next deploy to Staeffelsberg, move its grid out of the project
folder (scripts/tower-config move) - deploy.sh syncs with --delete and
would otherwise remove the file its config.ini points at.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

config/scan-staeffelsberg.csv

@@ -1,64 +0,0 @@
-# Staeffelsberg scan grid: 56 bearings round the full circle at one elevation,
-# matching the old firmware's 'ud56' sweep. Generated once from the retired
-# [Scan] grid generator (0 -> 353.57 deg in 56 steps, pitch 0) and kept here as
-# the explicit list, because the CSV is now the only source of waypoints.
-#
-# The sweep runs first to last, then returns to the first and repeats - always
-# the same order, never in reverse. The return leg is one long slew back across
-# the arc; that is the price of every pass being directly comparable.
-0.00,0
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