doc: user flatpak

.README.md

@@ -57,6 +57,8 @@ Mask `onedrive` service for new user:
 
 ## Debian Packages {#debian}
 
+TODO: dlocate / plocate…
+
 ### Installation
 
 ```sh
@@ -265,6 +267,10 @@ asdf plugin add python
 for Plugin in $(asdf plugin list); { echo $Plugin; asdf list $Plugin }
 ```
 
+### Updates
+
+TODO
+
 ## Newer Debian packages {#newer_versions}
 
 ### Flatpak
@@ -275,6 +281,14 @@ for Plugin in $(asdf plugin list); { echo $Plugin; asdf list $Plugin }
 
 TODO: [Where are all the installed flatpak apps .desktop files located](https://github.com/flatpak/flatpak/issues/1286)
 
+#### User Configuration
+
+```sh
+flatpak remote-add --user --if-not-exists \
+  --subset=verified_floss flathub https://dl.flathub.org/repo/flathub.flatpakrepo
+flatpak install --user org.mozilla.firefox
+```
+
 #### Overrides
 
 ```sh
@@ -539,6 +553,8 @@ bat ~/.config/nvim/README.md
 
 ### Dependencies
 
+- TODO: Debian 13 packages
+
 - kitty / NerdFont
 
 - Archives Management: