feat: Component for editing an article (#5032)

* feat: Component for editing an article

* chore: font fixes

* chore: Review fixes

* chore: fixes conflicts

* Update app/javascript/dashboard/components/helpCenter/EditArticle.vue

Co-authored-by: Nithin David Thomas <1277421+nithindavid@users.noreply.github.com>

* chore: Review fixes

Co-authored-by: Pranav Raj S <pranav@chatwoot.com>
Co-authored-by: Nithin David Thomas <1277421+nithindavid@users.noreply.github.com>

app/javascript/dashboard/i18n/locale/en/helpCenter.json

@@ -27,6 +27,10 @@
         "BY": "by"
       }
     },
+    "EDIT_ARTICLE": {
+      "TITLE_PLACEHOLDER": "Article title goes here",
+      "CONTENT_PLACEHOLDER": "Write your article here"
+    },
     "SIDEBAR": {
       "SEARCH": {
         "PLACEHOLDER": "Search for articles"