Rename project from inventree to vibetree

- go.mod module path (and every internal/vibetree import) inventree -> vibetree
- cmd/inventree/ -> cmd/vibetree/, deploy/inventree.service -> vibetree.service
- Default site name (seed data + the siteName template func's fallback)
  is now "vibetree", shown in the navbar, <title>, and login page
- Session cookie renamed inventree_session -> vibetree_session
- Default DB path data/inventree.db -> data/vibetree.db, CLI/log text,
  Dockerfile, docker-compose.yml, README, .gitignore/.dockerignore all
  updated to match

Existing installs: this changes the session cookie name (users will be
signed out once) and the default DB filename (point -db at your existing
file, or rename it, to keep your data).

deploy/vibetree.service

@@ -1,13 +1,13 @@
 [Unit]
-Description=inventree - IT asset inventory
+Description=vibetree - IT asset inventory
 After=network.target
 
 [Service]
 Type=simple
-User=inventree
-Group=inventree
-WorkingDirectory=/opt/inventree
-ExecStart=/opt/inventree/inventree serve -addr :8080 -db /opt/inventree/data/inventree.db
+User=vibetree
+Group=vibetree
+WorkingDirectory=/opt/vibetree
+ExecStart=/opt/vibetree/vibetree serve -addr :8080 -db /opt/vibetree/data/vibetree.db
 Restart=on-failure
 RestartSec=2
 
@@ -15,7 +15,7 @@ RestartSec=2
 NoNewPrivileges=true
 ProtectSystem=strict
 ProtectHome=true
-ReadWritePaths=/opt/inventree/data
+ReadWritePaths=/opt/vibetree/data
 PrivateTmp=true
 
 [Install]