chore: release `0.6.4`

fix: add `GitPython` to requirements.txt

fix: base64 image display

fix: use safe default data

fix: delay next to check

feat: add `next_to` feature

fix: merge pydantic panel data

feat: add `RedirectButton`

feat: public `KetcherBase`

feat: use `metaclass` for ketcher widget

feat: support popup ketcher editor

feat: support serve static file

merge: release `0.6.3`

chore: release `0.6.3`

docs: add jchem examples