clouds3d-only cleanup: drop Vanta/three.js/clouds2d, real-sky fixes, settlement lights, dynamic location anchor

vendor/LICENSE

@@ -1,25 +1,15 @@
-three.min.js - three.js (r128)
-Source: https://github.com/mrdoob/three.js
-License: MIT (https://github.com/mrdoob/three.js/blob/dev/LICENSE)
-Used under the terms of the MIT License.
-
 suncalc.js - SunCalc (v1.9.0)
 Source: https://github.com/mourner/suncalc
 Original author: Vladimir Agafonkin (mourner)
 License: ISC (https://github.com/mourner/suncalc/blob/master/LICENSE)
 Used under the terms of the ISC License.
 
-vanta.clouds.min.js - Vanta.js Clouds effect (v0.5.21)
-Source: https://github.com/tengbao/vanta
-Author: Teng Bao
-License: MIT (https://github.com/tengbao/vanta/blob/master/LICENSE)
-Used under the terms of the MIT License.
+stars.json - star catalogue derived from the Yale Bright Star Catalogue
+(5th ed., public catalogue data). Generated for this project; see the
+real-sky notes in clouds3d.js.
 
-vanta.clouds2.min.js - Vanta.js Clouds2 effect (v0.5.21)
-Source: https://github.com/tengbao/vanta
-Author: Teng Bao
-License: MIT (https://github.com/tengbao/vanta/blob/master/LICENSE)
-Used under the terms of the MIT License.
+clouds3d.js - original code for this project (same license as the
+repository root LICENSE).
 
-These libraries are vendored locally so the application can run fully offline
-without any external network dependencies.
+These libraries/data files are vendored locally so the application can
+run fully offline without any external network dependencies.