change directory structure to match index

Signed-off-by: Michel-FK <michel.stempin@funkey-project.com>

docs/developer_guide/hardware_reference/architecture.md

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+
+## Block Diagram
+
+Eventually, the design constraints listed in the previous section led
+to the following electronic diagram, featuring 3 main blocks:
+
+ - 1x main PCB (0.8 mm thickness) with components on both sides, the
+   maximum component height above PCB on both sides is 1.5 mm. Current
+   revision for this board is Revision E
+
+ - 1x 1.54” IPS TFT LCD screen with SPI interface and using a
+   custom flex cable, containing a built-in screen controller chip
+
+ - 1x 420 mAh 402540 LiPo battery, containing an active protection
+   circuitry
+
+![FunKey S Block Diagram](/assets/images/FunKey_S_Block_Diagram.png){.lightbox}
+
+## 3D View
+
+A 3D rendering of the PCBA done in KiCAD produces the images below:
+
+![FunKey Top](/assets/images/FunKey_S_Top.png){.lightbox}
+
+![FunKey Bottom](/assets/images/FunKey_S_Bottom.png){.lightbox}
+
+## BOM
+
+An interactive BOM is available in the [next section][1].
+
+## Schematics and Layout
+
+All the hardware design and production files required to build the
+[**FunKey S** retro-gaming console][2] electronic PCBA using the
+[KiCAD ECAD tools][3] are available as Open Hardware in the [FunKey S
+Hardware repository][4].
+
+???+ note "Topological vs. logical schematic symbols"
+
+    The **FunKey S** schematics use symbols and placement that are as
+    close as possible to their corresponding physical package and
+    layout, instead of defining symbols that are conveniently arranged
+    by logical properties. Even if this makes schematics more complex
+    at first sight, the benefit of this approach is that the step to
+    go from the schematics to the physical layout becomes much easier,
+    and so is the debugging of the physical board, which is then very
+    close to the schematics too.
+
+???+ note "Explicit schematic wires"
+
+    Another habit that is used everywhere in the **FunKey S**
+    schematics is that all signals (except power supplies and GND) are
+    routed using explicit wires, rather than counting on invisible
+    connection by net names and relying of the reader to search these
+    names all over the place. This forces related components to be
+    clustered in compact groups to shorten the wires, and put more
+    focus on inter-cluster signals, with a natural inclination to
+    unravel wire nests in the schematics before laying out the actual
+    board.
+
+???+ note "Power supply nets"
+
+    There are some "PWR_FLAG" symbols added here and there, which is
+    the proper way in KiCAD to declare that a given net has a known
+    supply and thus prevent the ERC (Electrical Rule Check) to throw
+    an error.
+
+The schematics will be discussed function by function in the following
+sections.
+
+[1]: https://htmlpreview.github.io/?https://github.com/FunKey-Project/FunKey-S-Hardware/blob/master/BOM/ibom.html
+[2]: https://www.funkey-project.com/
+[3]: https://kicad.org/
+[4]: https://github.com/FunKey-Project/FunKey-S-Hardware
+
+--8<--
+includes/glossary.md
+--8<--