docs: Improve Hardware_PowerSupply.de.md styling and add component datasheets

- Stylistic improvements:
  - Bold formatting for used components (XB4908A, BQ27441-G1, BQ25672, TPS63020, XC6206P332MR-G, TPS2116, HL3416)
  - Italic formatting for unused/comparison components (FM2113, AO3400A, MDD2302, BQ27427)
  - Consistent units formatting with proper spacing (μA, mV, mΩ, K/W)
  - Improved mathematical formulas and typography
  - Fixed German spelling and punctuation
  - Completed internal cross-references

- Added datasheets for all used components:
  - BQ25672 charger IC (doc/datasheets/Charger/)
  - TPS63020 buck-boost converter (doc/datasheets/DC-DC Converter/)
  - XC6206P332MR-G 3.3V LDO (doc/datasheets/LDO/)
  - TPS2116 power multiplexer (doc/datasheets/Power Mux/)
  - HL3416 N-FET MOSFET (doc/datasheets/MOSFET/)

- Linked all component references to their respective datasheets
- Fixed corrupted table of contents

Hardware/PowerProfiler/PowerProfiler.kicad_pro

@@ -616,7 +616,7 @@
     ],
     [
       "c0628d30-5a3b-4320-aa2a-0a2a91f3280a",
-      "Power"
+      "Battery"
     ]
   ],
   "text_variables": {}

Hardware/PowerProfiler/PowerProfiler.kicad_sch

@@ -21,7 +21,7 @@
 			(color 0 0 0 0.0000)
 		)
 		(uuid "c0628d30-5a3b-4320-aa2a-0a2a91f3280a")
-		(property "Sheetname" "Power"
+		(property "Sheetname" "Battery"
 			(at 73.66 52.6284 0)
 			(effects
 				(font
@@ -30,7 +30,7 @@
 				(justify left bottom)
 			)
 		)
-		(property "Sheetfile" "power.kicad_sch"
+		(property "Sheetfile" "battery.kicad_sch"
 			(at 73.66 90.7546 0)
 			(effects
 				(font