Complete API handlers refactoring to eliminate type switching and use repository pattern consistently

CHECKLIST.md

@@ -0,0 +1,20 @@
+# Before v0.1
+- [x] .insertr-gate
+- [x] .insertr
+- [ ] .insertr-content / .insertr-article
+- [x] .insertr-add
+- [ ] .insertr history and version control. Users can see previous version and see who changed what.
+- [ ] Authentication
+  - [ ] Set up Authentik app
+- [ ] Dev dashboard
+  - [ ] Overview of your sites
+  - [ ] Manage editor access
+- [ ] User dashboard?
+  
+- [ ] Production checklist
+  - [ ] Library served from CDN
+  - [ ] Clean up app configuration
+  - [ ] Complete documentation.
+
+# Sometime
+- [ ] Product/library website