Rename the repository to inbuxa-webmail

The repository moved from inbuxa/ihasmail-inbuxa to inbuxa/inbuxa-webmail,
matching inbuxa-server and inbuxa-admin. Point the source links, the image
name and the package link at the new name. The OAuth client id stays
ihasmail-inbuxa, since that is what the server registers.

web/src/lib/source.ts

@@ -8,4 +8,4 @@
  * ihasmail-inbuxa: INBUXA runs a modified ihasmail, so the offer is INBUXA's
  * fork and not the project it came from.
  */
-export const DEFAULT_SOURCE_URL = "https://git.coffeylabs.org/inbuxa/ihasmail-inbuxa";
+export const DEFAULT_SOURCE_URL = "https://git.coffeylabs.org/inbuxa/inbuxa-webmail";