added storm wiki frontend with extra themes

[jaigouk]

related issue

#64

changes

• Dracula soft dark color and other light and dark themes
• Duckduckgo search. and added searxng and SEARXNG_BASE_URL env var as a fallback option
• using ollama and added gpt-4o-mini as a fallback option
• save result files as '*.md'
• add date to to top of the result file
• added arize-phoenix to trace.

note

because this frontend is using "fallbacks", I thought it would be better to have separate example instead of overwriting the existing demo_light.

some tests files are added and checked with https://github.com/jaigouk/storm_wiki

[jaigouk]

i guess we can refine this further to configure search and llm models.

• list available search engines and add configuration options if there is api key for them in secrets. and we can also define which engine will be the fallback option.
• same for the LLMs.

There are 6 themes. 3 light themes and 3 dark themes.
we can add or adjust colors.

list page is little bit noisy. we can improve this

[jaigouk]

we can change this flow once we have more search engine options in the settings later. and let the user to choose which engine to use.

[shaoyijia]

Previously meant to assign the team members as the reviewer, since this looks like a pretty good enhancement. Sorry for any confusion!

[jaigouk]

is it ok to reopen and resolve some comments?

[shaoyijia]

Of course! Sorry for previous confusion.

[shaoyijia]

Thanks! Feel free to at me once you think it's ready for review. We are happy to help test and merge this.