docs/CONFIG.md, THEMING.md: Update Flatpak ID

We're Moment now.

docs/CONFIG.md

@@ -18,9 +18,9 @@ On Linux:
 
 For Flatpak installations:
 
-- `~/.var/app/io.github.mirukana.mirage/config/mirage` for config files
-- `~/.var/app/io.github.mirukana.mirage/data/mirage` for user data
-- `~/.var/app/io.github.mirukana.mirage/cache/mirage` for cache data
+- `~/.var/app/xyz.mx_moment.moment/config/moment for config files
+- `~/.var/app/xyz.mx_moment.moment/data/moment for user data
+- `~/.var/app/xyz.mx_moment.moment/cache/moment for cache data
 
 
 These locations can be overriden with environment variables, see 
@@ -41,8 +41,8 @@ the possible options and can be found at:
 - [`src/config/settings.py`][1] in this repository
 - `/usr/local/share/examples/moment/settings.py` or 
   `/usr/share/examples/moment/settings.py` on Linux installations
-- `~/.local/share/flatpak/app/io.github.mirukana.mirage/current/active/files/share/examples/mirage/settings.py` for per-user Flatpak installations
-- `/var/lib/flatpak/app/io.github.mirukana.mirage/current/active/files/share/examples/mirage/settings.py` for system-wide Flatpak installations
+- `~/.local/share/flatpak/app/xyz.mx_moment.moment/current/active/files/share/examples/moment/settings.py` for per-user Flatpak installations
+- `/var/lib/flatpak/app/xyz.mx_moment.moment/current/active/files/share/examples/moment/settings.py` for system-wide Flatpak installations
 
 Rather than copying the entire default file, it is recommended to 
 [`include`](PCN.md#including-built-in-files) it and only add the settings 

docs/THEMING.md

@@ -11,8 +11,8 @@ for example:
 Or for Flatpak users:
 
 ```sh
-    cp mirage/src/themes/Foliage.qpl \
-       ~/.var/app/io.github.mirukana.mirage/data/mirage/themes/MyTheme.qpl
+    cp moment/src/themes/Foliage.qpl \
+       ~/.var/app/xyz.mx_moment.moment/data/moment/themes/MyTheme.qpl
 ```
 
 The `theme` property in [`settings.py`](CONFIG.md#settingspy) would need