Context: having search is almots essential feature for most of the
websites. This commit adds very basic functionality based on lunrjs
library. It allows to build an use search index.
Changes:
- Build search index using 11ty template
- Adds postbuild step to build lunr index
- Adds netlify function to serve as API for search
- Adds search page and links to notes pages
- Wraps hashtags with proper styling and adds search by hashtag link to
them
- Adds missing obsidian class for content
