Fix question numbering, remove broken links, and make OneDrive path configurable

[Copilot]

Addresses review feedback from PR #281 identifying duplicate question numbers, broken navigation links, and hardcoded user paths.

Changes

Precourse questionnaire (precourse.qmd)

• Fixed duplicate question numbering: Section 1.2 had two Q5s, Section 2 started over at Q4
• Renumbered all questions sequentially Q1-Q26
• Removed broken link to non-existent precourse-interactive.html, replaced with note that interactive version is coming

Navigation (_quarto.yml)

• Commented out link to missing precourse-interactive.qmd file

Build script (scripts/create-docxs.sh)

• Replaced hardcoded user path with TDS_DEST_DIR environment variable
• Added null check to prevent failures when variable unset

# Before
DEST_DIR="/c/Users/georl/OneDrive - University of Leeds/career/modules/tds/2025-26"
if [ -d "$DEST_DIR" ]; then

# After
DEST_DIR="${TDS_DEST_DIR:-}"
if [ -n "$DEST_DIR" ] && [ -d "$DEST_DIR" ]; then

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[Robinlovelace]

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