message: Update dev README
diff: The manager is responsible for detecting the correct root file and once detected to parse the whole project. Its logic is explained in `manager-logic.odg`.
  -## Scripts for Intelisense
  -
  -We describe the purpose of the scripts found in the current directory.
  +## Scripts for Intellisense
  These scripts are actually only frontend to the `pyintel` package, which implements the core mechanisms. It fetches the latest list of packages and classes along with their descriptions from CTAN at https://ctan.org/pkg. It uses the TeXLive Package database `texlive.tlpdb` retrieved from https://mirrors.ircam.fr/pub/CTAN/systems/texlive/tlnet/tlpkg/texlive.tlpdb.
  