Feature request: specify theme in plugin config

[Al3cLee]

Hi,

I prefer the light theme as my default, but it seems that this is not something I can configure directly in my neovim setup; rather I have to click the moon / sun icon every time I open a preview. This is getting a bit annoying.

Please add a config option to specify the default theme, thanks!

[selimacerbas]

Thanks, agreed this should be configurable. PR #16 (@gogongxt) does exactly this. I've asked for one small rename (theme to default_theme so the name stays free for richer theme config later), then I'll merge. Closing this when #16 lands.