feat(announcements): add markdown support (#1371)

* feat(announcements): add markdown support

* feat(announcements): add information about announcement formatting in readme

* feat(announcements): bump packages versions for marked and dompurify

* feat(announcements): bump versions for marked and dompurify in package-lock.json

* fix(announcements): md to link was not working since the conflict merge

* fix(announcements): fix time before message and not after

* feat(announcements): past announcements add markdown support

* feat(announcements): static files

web/app/package.json

@@ -15,7 +15,9 @@
     "clsx": "^2.1.1",
     "core-js": "^3.45.0",
     "date-fns": "^4.1.0",
+    "dompurify": "^3.3.0",
     "lucide-vue-next": "^0.539.0",
+    "marked": "^16.4.1",
     "tailwind-merge": "^3.3.1",
     "vue": "^3.5.18",
     "vue-chartjs": "^5.3.2",