feat(eww): add "Activate Linux" widget and assets

Add ".gitattributes" for LFS, update flake.nix, and include new eww widget, README, image, SCSS, and Yuck configuration.

home/services/eww/README.md

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+# "Activate Linux"
+
+"Activate Linux" text for [Eww](https://github.com/elkowar/eww/)
+
+![Activate Linux](activate-linux.png)

home/services/eww/eww.scss

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+.activate-linux {
+  color: rgba(250, 250, 250, 0.5);
+
+  &.background {
+    background: none;
+  }
+}

home/services/eww/eww.yuck

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+(defwidget activate-linux []
+  (box
+    :orientation "v"
+    :halign "start"
+    :valign "start"
+    (label :xalign 50 :markup "<span font_size=\"large\">Activate Linux</span>")
+    (label :xalign 50 :text "Go to Settings to activate Linux")))
+
+(defwindow activate-linux
+  :monitor 0
+  :stacking "fg"
+  :geometry (geometry :x "8px" :y "32px" :width "250px" :anchor "bottom right")
+  (activate-linux))