how to change default language and clear demo code

[yuexiadudiao]

i deploy this project for myself, and mostly write c++ code, how to set c++ as default language and don't show demo code on editor

i try to modify App.js ,but it doesnt work as what i want

[shobrook]

Thanks for pointing this out. Right now the default language is Python, but I can open a PR to cache the language you select and the code in the editor.

[Mbladra]

@waqaspathan00 made a fix for caching the language with #24