FEAT: adding general directory

...ral/10-comment-assister-a-une-demonstration-a-distance.md

src/content/general/12-intervention-a-distance.md

src/content/general/38-qu-est-ce-qu-un-logiciel-libre.md

src/content/general/85-qu-est-ce-que-lutece.md

src/content/general/_index.md