Add explicit instructions for building in the command line.

dossier-notes.org

@@ -9,6 +9,16 @@
   professorship applications later on, but the career tracking part is
   increasingly important.
 
+* Building in command line
+  Building the dossier follows the usual LaTeX build process.
+
+  1. Ensure =biber= is available, e.g. by running the script
+ =guix-env=.
+  2. Run =lualatex candidature.tex= once.
+  3. Run =biber canditature= to update the references.
+  2. Run =lualatex candidature.tex= a second time and a the third time
+     to get all the references right.
+
 * Structure
   The dossier is split over very many =.tex= files, a
  =candidature.sty= file, and a number of =.bib= files storing various