chore: clean up repo structure and polish docs

- Rewrite .gitignore in English with proper patterns for build artifacts, storage files, and IDE files
- Remove tracked build assets (hash-based) and storage files from git
- Update LICENSE copyright to 2026 Remco (Epicnabbo)
- Fix clone URLs in README (remove placeholder gitea-server)
- Sync docs/INSTALL.md with README installation guide

.gitignore

@@ -1,42 +1,49 @@
-# Negeer wachtwoorden en database-instellingen
+# --- Environment ---
 .env
 .env.backup
 .env.testing
-config.php
-wp-config.php
-/uploads/
-/temp/
-*.log
+.env.production
 
-# Geen zware afhankelijkheden pushen
+# --- Dependencies ---
 node_modules/
 vendor/
 
-# UITZONDERING: Vertaalbestanden in lang/vendor wel pushen
-/lang/vendor/
+# --- Build artifacts (hashed filenames) ---
+public/build/assets/
+public/build/hot
 
-# Systeembestanden (Mac/Windows troep)
+# --- Storage (uploaded files, cache, logs, sessions) ---
+storage/app/livewire-tmp/
+storage/app/public/
+storage/clockwork/
+storage/debugbar/
+storage/framework/views/
+storage/framework/cache/
+storage/framework/sessions/
+storage/framework/testing/
+storage/logs/
+
+# --- IDE & OS ---
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
 .DS_Store
 Thumbs.db
 
-# VPS automation scripts (niet pushen naar GitLab)
-watch.sh
-check-updates.sh
-
-# Cache bestanden (niet pushen naar GitLab)
-/storage/framework/views/
-/storage/framework/cache/
-/storage/framework/sessions/
-/storage/logs/
-/storage/debugbar/rr
+# --- Config (no default .env push) ---
+config.php
 .rr.yaml
 
-# Lockfiles (kies 1 package manager)
-package-lock.json
-
-# Overgebleven test/temp bestanden
+# --- Tests & Temp ---
 ci_test.txt
 cookies.txt
+.phpunit.result.cache
 
-# GitHub workflows (pushen naar GitLab)
-!/.github/workflows/
+# --- Lock files (yarn.lock is tracked, package-lock.json is not) ---
+package-lock.json
+
+# --- Scripts (local-only) ---
+watch.sh
+check-updates.sh