FIXUP: Increase the storage space

BUILD.md

@@ -260,7 +260,7 @@ The following instructions require typing commands in a terminal in dom0.
 
    ```
    qvm-create --class AppVM --label red --template fedora-40-dz dz
-   qvm-volume resize dz:private $(numfmt --from=auto 5Gi)
+   qvm-volume resize dz:private $(numfmt --from=auto 20Gi)
    ```
 
    > :bulb: Alternatively, you can use a different app qube for Dangerzone
@@ -268,8 +268,9 @@ The following instructions require typing commands in a terminal in dom0.
    > steps below.
    >
    > In the commands above, we also resize the private volume of the `dz` qube
-   > to 5GiB, since the Tesseract data that will be downloaded in the next steps
+   > to 20GiB, since you may need some extra storage space when developing on
-   > take a bit of space.
+   > Dangerzone (e.g., for container images, Tesseract data, and Python
+   > virtualenvs).
 
 4. Add an RPC policy (`/etc/qubes/policy.d/50-dangerzone.policy`) that will
    allow launching a disposable qube (`dz-dvm`) when Dangerzone converts a