feat: Add .env.example file and update Navbar for market navigation

- Introduce a new .env.example file for Nostr and API configuration, including settings for push notifications and market relays.
- Update Navbar.vue to include a new navigation item for the market, enhancing user access to market features.
- Extend localization support by adding market translations in English, Spanish, and French.

src/i18n/locales/en.ts

@@ -7,6 +7,7 @@ const messages: LocaleMessages = {
     directory: 'Directory',
     faq: 'FAQ',
     events: 'Events',
+    market: 'Market',
     login: 'Login',
     logout: 'Logout'
   },

src/i18n/locales/es.ts

@@ -7,6 +7,7 @@ const messages: LocaleMessages = {
     directory: 'Directorio',
     faq: 'Preguntas Frecuentes',
     events: 'Eventos',
+    market: 'Mercado',
     login: 'Iniciar Sesión',
     logout: 'Cerrar Sesión'
   },

src/i18n/locales/fr.ts

@@ -7,6 +7,7 @@ const messages: LocaleMessages = {
     directory: 'Répertoire',
     faq: 'FAQ',
     events: 'Événements',
+    market: 'Marché',
     login: 'Connexion',
     logout: 'Déconnexion'
   },

src/i18n/types.ts

@@ -5,6 +5,7 @@ export interface LocaleMessages {
     directory: string
     faq: string
     events: string
+    market: string
     login: string
     logout: string
   }