Support downloading directories as a zip archive (#106)

* Add directory download as zip feature

Implements the ability for users to download directories as zip files if enabled in config. Adds a new API route for directory zipping, updates UI components to show a download button for directories, and introduces related config and type changes. Also includes a new download icon.

* Windows path bugfix

* Include empty directories in zip archive

* Address feedback

- `isDirectoryDownloadsAllowed` -> `areDirectoryDownloadsAllowed`
- send `parentPath` & `name` to API instead of resolving `fullPath` on client
- call `ensureUserPathIsValidAndSecurelyAccessible` before zipping
- set config `allowDirectoryDownloads` default to `false`
- add `zip` to Dockerfile and replace in-house zip algorithm
- replace `download.svg` with heroicon's `arrow-down-tray`
- `replace` with glob -> `replaceAll` with string

* Cleanup apt-get command

* Remove unused zip archive and directory functions

lib/types.ts

@@ -184,6 +184,8 @@ export interface Config {
     rootPath: string;
     /** If true, public file sharing will be allowed (still requires a user to enable sharing for a given file or directory) */
     allowPublicSharing: boolean;
+    /** If true, directories can be downloaded as zip files */
+    allowDirectoryDownloads: boolean;
   };
   core: {
     /** dashboard and files cannot be disabled */