added tutorial to fix unstuck glass

docs/user_manual/tutorials/hardware/fix_unstuck_screen.md

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+Some FunKey S consoles coming from the first production batch might have an issue with the front glass not sticking correctly to the left side of the casing:
+
+![unstuck_screen_example](/assets/images/fix_unstuck_screen/unstuck_example.png)
+
+
+The following tutorial explains how to simply stick back the screen using standard cyanoacrylate glue. The necessary material is:
+
+- Standard cyanoacrylate glue (US: Gorilla Super Glue, Europe: Loctite Superglue) 
+- A toothpick 
+- Tape
+
+![unstuck_screen_example](/assets/images/fix_unstuck_screen/DSC08633.jpg)
+
+
+### **STEP 1 - Protecting the plastic casing with tape** {.step-title}
+
+![tape](/assets/images/fix_unstuck_screen/DSC08640.jpg){.step-thumb}
+![tape](/assets/images/fix_unstuck_screen/DSC08641.jpg){.step-thumb}
+
+Stick a thin layer of tape on the plastic casing to the left side of the screen. This will avoid any glue to come in contact with it.
+
+### **STEP 2 - Preparing the glue** {.step-title}
+
+![prepare glue](/assets/images/fix_unstuck_screen/DSC08643.jpg){.step-thumb}
+![prepare glue](/assets/images/fix_unstuck_screen/DSC08644.jpg){.step-thumb}
+![prepare glue](/assets/images/fix_unstuck_screen/DSC08645.jpg){.step-thumb}
+
+Appy one drop of glue on a flat impermeable surface (the back of some tape for example). One drop is enough.
+
+### **STEP 3 - Applying the glue** {.step-title}
+
+![apply glue](/assets/images/fix_unstuck_screen/DSC08646.jpg){.step-thumb}
+![apply glue](/assets/images/fix_unstuck_screen/DSC08650.jpg){.step-thumb}
+![apply glue](/assets/images/fix_unstuck_screen/DSC08651.jpg){.step-thumb}
+
+Dip the tip of the toothpick in the glue and apply it inside the plastic casing alongside the left edge. Multiple dips can be necessary to cover the whole side.
+
+The toothpick tip will soften with the glue and act as a paintbrush.
+
+!!! note
+    Careful not to put too much glue in the casing.
+
+
+
+### **STEP 4 - Sticking the glass** {.step-title}
+
+![apply force](/assets/images/fix_unstuck_screen/DSC08652.jpg){.step-thumb}
+![apply force](/assets/images/fix_unstuck_screen/DSC08654.jpg){.step-thumb}
+![apply force](/assets/images/fix_unstuck_screen/DSC08655.jpg){.step-thumb}
+
+Use your thumb to apply force on the left side of the glass for at least 2 minutes (the longer the better, this leaves more time for the glue to stick). 
+
+You can remove the protective tape in the meantime.
+
+
+### **STEP 5 - All done** {.step-title}
+
+![apply force](/assets/images/fix_unstuck_screen/DSC08656.jpg){.step-thumb}
+![apply force](/assets/images/fix_unstuck_screen/DSC08660.jpg){.step-thumb}
+
+The glass should now hold tightly to the left side of the casing, you're ready to play!
+
+--8<--
+includes/glossary.md
+--8<--