Scrub location/IP from public assets; add gitleaks pre-commit hook

- README: replace real lat/lon in the config example with 0.0/0.0 and
  drop the city name from the screenshot caption
- viewer screenshot: re-captured with the receiver IP masked
- add .pre-commit-config.yaml running gitleaks to block secrets from
  reaching gitea or the public GitHub mirror

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.github/FUNDING.yml

@@ -0,0 +1 @@
+buy_me_a_coffee: adsbit

.gitignore

@@ -17,8 +17,9 @@ __pycache__/
 .claude/
 CLAUDE.md
 
-# Gitea token
-.gitea-token
+# Local secrets / tokens
+*.token
+.git-credentials
 
 # OS
 .DS_Store

.pre-commit-config.yaml

@@ -0,0 +1,14 @@
+# Pre-commit hooks for ADS-Bit.
+#
+# Setup (once):
+#   pip install pre-commit
+#   pre-commit install
+#
+# Thereafter gitleaks scans every commit for secrets (tokens, keys,
+# password hashes) before they can reach gitea or the public GitHub mirror.
+# Run manually across the whole tree with:  pre-commit run --all-files
+repos:
+  - repo: https://github.com/gitleaks/gitleaks
+    rev: v8.18.4
+    hooks:
+      - id: gitleaks

README.md

@@ -6,7 +6,19 @@
 
 A retro SNES-style side-view flight tracker that displays ADS-B aircraft data with custom pixel art sprites.
 
-![ADS-Bit Screenshot](screenshots/screenshot.png)
+## Screenshots
+
+### Live viewer
+
+Real-time ADS-B traffic rendered as pixel-art sprites over a directional background — here the East view, with a desert skyline on the horizon. Aircraft are labelled with callsign, altitude, and distance, and listed in the sidebar sorted by range.
+
+![Live viewer with aircraft in view](screenshots/viewer.png)
+
+### In-app pixel editor
+
+Draw and edit aircraft sprites directly in the browser: pencil, eraser, line/rectangle/ellipse shapes, fill bucket, select & move, zoom/pan, undo/redo, custom palettes, and an adjustable reference overlay. Saving uploads the sprite back to the running tracker — no external tools needed.
+
+![In-browser pixel sprite editor](screenshots/pixel-editor.png)
 
 ## Features
 
@@ -27,7 +39,7 @@ A retro SNES-style side-view flight tracker that displays ADS-B aircraft data wi
 
 ```bash
 # Clone the repository
-git clone https://gitea.chops.one/allen/ADS-Bit.git
+git clone https://github.com/AllenNPIT/ADS-Bit.git
 cd ADS-Bit
 
 # Install dependencies
@@ -124,8 +136,8 @@ ADS-Bit uses a first-run setup wizard to configure your installation. You can al
   "receiver_port": 30003,
   "location": {
     "name": "My Location",
-    "lat": 36.2788,
-    "lon": -115.2283
+    "lat": 0.0,
+    "lon": 0.0
   },
   "web_port": 2001,
   "theme": "desert"