Add env-configurable GA/form/map; remove & artifacts; verify clone completeness

- Remove 4 stray '&' files (crawl artifact) that duplicated footer/about-us/contactus/root
- Replace hardcoded GA id, form email, map src with placeholders (GA_ID, FORM_EMAIL, GMAP_EMBED)
- Add entrypoint.sh: envsubst injects env vars into HTML at container startup
- Add .env.example + .dockerignore/.gitignore guarding .env secrets
- Google Map type A (free embed, no API key) configurable via GMAP_LAT/LNG
- Verify: all 39 pages, images (38/home), content blocks (296) match original; 0 missing assets

Full clone comparison against www.mitsuthailand.com confirms sections complete.

.dockerignore

@@ -0,0 +1,15 @@
+.git
+.gitignore
+.env
+.env.*
+!.env.example
+*.md
+mirror_log*.txt
+__pycache__
+*.pyc
+postprocess.py
+repair.py
+cleanup.py
+common.py
+mirror.py
+rewrite.py