Add CardDav and CalDav servers (#80)

* Add CardDav and CalDav servers

This implements the servers, but not the clients (yet). The implementation is essentially a proxy to Radicale (as a container in `docker-compose.yml`), with certain security assurances.

If you're upgrading, basically you'll need to create a new `data-radicale` directory, and everything else should just work.

This will also release v2.3.0 with those enabled by default. Tested with Thunderbird and Apple Calendar + Contacts.

To disable these, simply add the new config details and comment out or don't add the new `radicale` service from `docker-compose.yml`.

Related to #56

islands/files/FilesWrapper.tsx

@@ -7,12 +7,23 @@ interface FilesWrapperProps {
   initialPath: string;
   baseUrl: string;
   isFileSharingAllowed: boolean;
+  isCardDavEnabled?: boolean;
+  isCalDavEnabled?: boolean;
   fileShareId?: string;
 }
 
 // This wrapper is necessary because islands need to be the first frontend component, but they don't support functions as props, so the more complex logic needs to live in the component itself
 export default function FilesWrapper(
-  { initialDirectories, initialFiles, initialPath, baseUrl, isFileSharingAllowed, fileShareId }: FilesWrapperProps,
+  {
+    initialDirectories,
+    initialFiles,
+    initialPath,
+    baseUrl,
+    isFileSharingAllowed,
+    isCardDavEnabled,
+    isCalDavEnabled,
+    fileShareId,
+  }: FilesWrapperProps,
 ) {
   return (
     <MainFiles
@@ -21,6 +32,8 @@ export default function FilesWrapper(
       initialPath={initialPath}
       baseUrl={baseUrl}
       isFileSharingAllowed={isFileSharingAllowed}
+      isCardDavEnabled={isCardDavEnabled}
+      isCalDavEnabled={isCalDavEnabled}
       fileShareId={fileShareId}
     />
   );