Tutorial: graphene on h-BN — Giovannetti 2007 reproduced (SOF-8064)

[VsevolodX]

Rewrites the graphene-on-h-BN tutorials to Giovannetti et al., Phys. Rev. B 76, 073103 (2007)
as written: the paper's cell (four-layer AA' h-BN, a = 2.445 Å), its three stackings, its distance
scan, and its Figs. 2–4 beside the notebook's own results.

SOF-8064. Notebook side: mat3ra/api-examples#381.

• Structure page: the build as the notebook does it — standata bulk h-BN and graphene strained to
  2.445 Å, the h-BN layer spacing set to 3.24 Å, the upper layer translated so the stacking is AA',
  the four-layer slab, one interface per stacking × distance with the registry shift; parameter cell
  quoted verbatim; manuscript block now Giovannetti.
• Simulation page: ten sections as the merged sibling; §4 quotes the two parameter cells
  verbatim and lists every setting against the paper's; §6 carries the paper's numbers (equilibrium
  distances, gaps, h-BN gap, effective mass, energy ordering) with a measured column filled from the
  run; Giovannetti Figs. 1, 2 and 4 in the introduction; Troubleshooting is the single
  material-not-found entry.
• @Giovannetti2007 in references.bib; nav lines in both mkdocs files; the "Coming Soon" entries in
  overview.md and index-guide.md link to the page.

mkdocs build is clean on both sites for the touched pages. Known stale items: the structure page's
"notebook setup" screenshot shows the previous parameter cell, and overview.md still uses the old
thumbnail (Jung's figure).

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