feat(a11y): add skip link for improved navigation accessibility

apps/backoffice/src/app/i18n/locales/am.ts

@@ -11,6 +11,10 @@ export const am: Translations = {
     tagline: "የቁጥጥር ማዕከል",
   },
 
+  a11y: {
+    skipToContent: "ወደ ዋናው ይዘት ዝለል",
+  },
+
   msg: {
     genericError: "የሆነ ስህተት ተፈጥሯል። እባክዎ እንደገና ይሞክሩ።",
     serverError: "የሰርቨር ስህተት። እባክዎ ቆየት ብለው እንደገና ይሞክሩ።",

apps/backoffice/src/app/i18n/locales/en.ts

@@ -10,6 +10,11 @@ export const en = {
     tagline: 'Control Center',
   },
 
+  // Strings only assistive technology encounters.
+  a11y: {
+    skipToContent: 'Skip to main content',
+  },
+
   msg: {
     genericError: 'Something went wrong. Please try again.',
     serverError: 'Server error. Please try again later.',