Update Git docs

app/docs/guides/training/git/ scripts/elso.md

app/docs/guides/training/git/ scripts/masodik.md

app/docs/guides/training/git/01_intro.md

app/docs/guides/training/git/02_versioning.md

app/docs/guides/training/git/04_installation.md

app/docs/guides/training/git/05_basics.md

app/docs/guides/training/git/06_branch.md

app/docs/guides/training/git/07_basics_and_ssh.md

app/docs/guides/training/git/08_segedlet.md

app/docs/guides/training/git/09_hazi.md

app/docs/guides/training/git/img/me.jpg

app/sidebars.js