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/web/handlers_settings.go

@@ -4,7 +4,7 @@ import (
 	"net/http"
 	"strconv"
 
-	"inventree/internal/models"
+	"vibetree/internal/models"
 )
 
 type settingsPageData struct {
@@ -17,7 +17,7 @@ type settingsPageData struct {
 
 func (a *App) handleSettingsPage(w http.ResponseWriter, r *http.Request) {
 	ctx := r.Context()
-	siteName, err := a.Settings.Get(ctx, "site_name", "inventree")
+	siteName, err := a.Settings.Get(ctx, "site_name", "vibetree")
 	if err != nil {
 		writeErr(w, http.StatusInternalServerError, err.Error())
 		return