Add 1-page short CV variant, ORCID, profile photo, pre-commit hook

- cv-short.tex: two-column paracol layout (66/34) with curated content
  in the left column and an "at a glance" sidebar on the right.
  Locally tightens parskip, \cvsection and \cvevent so everything fits
  on a single A4 page, and redefines the sidebar list helper \sbitem
  to replace altacv's non-wrapping tikz \cvtag in the narrow column.
- chapters/short/{current,education,grants-selected,products,
  pubs-selected,sidebar}.tex: hand-curated highlight content
  (top 6 publications, top 6 grants, condensed two-line products,
  stats + recognition + leadership + research-focus sidebar blocks).
- chapters/header.tex / preamble.tex: ORCID 0000-0001-7512-8541
  via a new \orcid info field (faOrcid icon); blog field for
  giorgio.gilest.ro.
- images/gilestro.png: profile photo, used only by the short CV via
  altacv's circular \photoR.
- hooks/pre-commit + `make install-hooks`: rebuilds every variant on
  any .tex/.cls/Makefile change, aborts the commit on build failure,
  and stages refreshed PDFs into pdf/.
- Makefile: short target, hook-install target, dep glob extended to
  chapters/short/*.tex so the short build refreshes when its sources
  change.

chapters/short/current.tex

@@ -0,0 +1,7 @@
+% Current position + brief bio (short CV)
+\cvsection{Current position}
+
+\cvevent{Reader / Associate Professor}{Imperial College London, Department of Life Sciences}{}{}
+
+\noindent\small
+Systems neurobiologist studying the function of \textbf{sleep} and the principles of behaviour in \textit{Drosophila melanogaster}. The lab develops \textbf{open-source high-throughput instrumentation} (Ethoscopes), \textbf{computational frameworks} (Rethomics, Ethoscopy) and applies them to questions ranging from sleep homeostasis to the evolution of behaviour across species.\par