[Feature request] Render Markdown in Search Results

[zcysxy]

Is your feature request related to a problem? Please describe. Currently, the search results provide a preview of the source code. It would provide clearer information if it can render it as Markdown. This FR is related to #36.

Describe the solution you'd like Use Obisidian API MarkdownRenderer to render the results. For example, see https://github.com/debanjum/khoj/blob/3ae603bd93a56fe61a83c72f296eb9319c4bbc8e/src/interface/obsidian/src/modal.ts#L92-L99 and this patch https://github.com/debanjum/khoj/pull/135. And I noticed no performance delay.