feat: item-attachments CRUD (#22)

* change /content/ -> /homebox/

* add cache to code generators

* update env variables to set data storage

* update env variables

* set env variables in prod container

* implement attachment post route (WIP)

* get attachment endpoint

* attachment download

* implement string utilities lib

* implement generic drop zone

* use explicit truncate

* remove clean dir

* drop strings composable for lib

* update item types and add attachments

* add attachment API

* implement service context

* consolidate API code

* implement editing attachments

* implement upload limit configuration

* improve error handling

* add docs for max upload size

* fix test cases

frontend/lib/strings/index.ts

@@ -0,0 +1,14 @@
+export function titlecase(str: string) {
+  return str
+    .split(" ")
+    .map(word => word[0].toUpperCase() + word.slice(1))
+    .join(" ");
+}
+
+export function capitalize(str: string) {
+  return str[0].toUpperCase() + str.slice(1);
+}
+
+export function truncate(str: string, length: number) {
+  return str.length > length ? str.substring(0, length) + "..." : str;
+}