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).

internal/assets/assets_test.go

@@ -8,11 +8,11 @@ import (
 	"strings"
 	"testing"
 
-	"inventree/internal/assets"
-	"inventree/internal/database"
-	"inventree/internal/folders"
-	"inventree/internal/models"
-	"inventree/internal/settings"
+	"vibetree/internal/assets"
+	"vibetree/internal/database"
+	"vibetree/internal/folders"
+	"vibetree/internal/models"
+	"vibetree/internal/settings"
 )
 
 // Seed data from migrations/0002_seed.sql gives us stable IDs to rely on: