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

@@ -1,61 +0,0 @@
-# Scan grid — capture waypoints, one "yaw_deg,pitch_deg" per line.
-# 52 Positionen, Yaw gegen den Uhrzeigersinn (fallend, über Nord 0°/360°)
-# von 131.5° (East) bis West Limit 160.0°
-# (Sperrzone 131.5°–160.0° über Süden, mechanisch nicht erreichbar).
-# Schrittweite konstant 6.5° = exakt FoV -> 0.0° Überlappung (Kante an Kante).
-# Pitch konstant 0. Blank lines and lines starting with '#' are ignored.
-#
-# Reference this file from config.ini:  [Scan] grid_file = config/scan.csv
-
-131.5,0
-125.0,0
-118.5,0
-112.0,0
-105.5,0
-99.0,0
-92.5,0
-86.0,0
-79.5,0
-73.0,0
-66.5,0
-60.0,0
-53.5,0
-47.0,0
-40.5,0
-34.0,0
-27.5,0
-21.0,0
-14.5,0
-8.0,0
-1.5,0
-355.0,0
-348.5,0
-342.0,0
-335.5,0
-329.0,0
-322.5,0
-316.0,0
-309.5,0
-303.0,0
-296.5,0
-290.0,0
-283.5,0
-277.0,0
-270.5,0
-264.0,0
-257.5,0
-251.0,0
-244.5,0
-238.0,0
-231.5,0
-225.0,0
-218.5,0
-212.0,0
-205.5,0
-199.0,0
-192.5,0
-186.0,0
-179.5,0
-173.0,0
-# 166.5,0 blocked view
-160.0,0