Add back to home page links and fix × symbols

Current-Challenge.md

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 # Current Challenge: October 2025
 
 ## "Is it Glass or Clearly Natural?"
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   - PCTG (Polyethylene Terephthalate Glycol)
   - PLA (Polylactic Acid)
 - **Maximum Filament Usage**: 250g per entry
-- **Model Specification**: Cylinder - 25mm diameter × 50mm height
+- **Model Specification**: Cylinder - 25mm diameter x 50mm height
 - **Print Mode**: Vase mode (approximately 6 grams of filament)
 
 ### Competition Categories
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 4. **Challenge Adherence** (10%): Following material constraints and using supplied model
 
 ### Submission Requirements
-- **Model Compliance**: Cylinder must measure 25mm diameter × 50mm height
+- **Model Compliance**: Cylinder must measure 25mm diameter x 50mm height
 - **Vase Mode**: Must be printed in vase mode (single perimeter wall)
 - **Weight Verification**: Should use approximately 6 grams of filament
 - **Documentation**: Include photos showing transparency (with light sources)
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 - **Fusion 360**: Create cylinder sketch, extrude to 50mm height
 - **Tinkercad**: Use cylinder shape, adjust dimensions
 - **FreeCAD**: Create cylinder with specified dimensions
-- **Any CAD Software**: Simple cylinder 25mm diameter × 50mm height
+- **Any CAD Software**: Simple cylinder 25mm diameter x 50mm height
 
 ## Awards & Recognition
 

Ideas-and-Planning.md

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 # Ideas and Planning
 
 ## Future Event Concepts

Important-Dates.md

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 # Important Dates
 
 ## Upcoming Meetup Schedule Changes

Itinerary.md

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 # Meeting Itinerary
 
 ## Meeting Format & Timeline