docs: keep the theme.conf.user symlink in the user's home

The install block ran in a root shell, where ~ and $HOME expand to
/root, so the symlink pointed at /root/.local/share/udt and the
greeter silently fell back to theme.conf and the bundled power icons.
Run the block with sudo from the user's shell, and drop the obsolete
LoginCard.qml on upgrade.

1 files changed, 10 insertions, 4 deletions

diff --git a/README.md b/README.md
index 24c52c9..b9b76f3 100644
--- a/README.md
+++ b/README.md
@@ -39,11 +39,17 @@ when a theme has no match, the bundled `theme/icons/*.svg` draw instead.
 ## Install
 
 The theme code is copied by root, then SDDM is pointed at it. Both are one-time
-root edits:
+root edits. Run them with `sudo` from your own shell, so `$HOME` is your home,
+not root's; in a root shell write the full path instead:
 
-    install -d /usr/share/sddm/themes/udt
-    cp -r <this repo>/theme/. /usr/share/sddm/themes/udt/
-    ln -sfn ~/.local/share/udt/sddm-theme.conf /usr/share/sddm/themes/udt/theme.conf.user
+    sudo install -d /usr/share/sddm/themes/udt
+    sudo cp -r <this repo>/theme/. /usr/share/sddm/themes/udt/
+    sudo rm -f /usr/share/sddm/themes/udt/components/LoginCard.qml
+    sudo ln -sfn "$HOME/.local/share/udt/sddm-theme.conf" /usr/share/sddm/themes/udt/theme.conf.user
+
+The symlink must point at your home. If it points at `/root`, the greeter finds
+no live config and silently falls back to the static `theme.conf` palette and
+the bundled power icons.
 
 Select the theme by setting `Current=udt` under `[Theme]` in `/etc/sddm.conf`.
 That file has the highest precedence in SDDM's config order