Refactoring Document storage (#5)

- Major refactoring that makes Doc a class with properties
- Data made only shallow reactive, for a good speedup of initial load
- Minor bugfixes and UX improvements along the way
- Fixed handling of hash and question marks in URLs (was confusing Vue Router)
- Search made stricter to find good results (not ignore all punctuation)

frontend/src/components/FileModified.vue

@@ -5,7 +5,7 @@
 </template>
 
 <script setup lang="ts">
-import type { Document } from '@/repositories/Document'
+import { Doc } from '@/repositories/Document'
 import { computed } from 'vue'
 
 const datetime = computed(() =>
@@ -17,6 +17,6 @@ const tooltip = computed(() =>
 )
 
 const props = defineProps<{
-    doc: Document
+    doc: Doc
 }>()
 </script>