This PR adds a simple filter/search functionality to the bibliography.
It can be used in two ways:
1. Simply enter a search term in the input box.
2. Send a search term via the `location.hash`, e.g.,
https://alshedivat.github.io/al-folio/publications/#mechanics
**Notes:**
- The search box is optional. It can be simply removed if anyone does
not like it.
- Searching via `hash` works without the search box. My idea is to use
this functionality to index all BibTeX entries via the `ctrl-k` search
and link them via their BibTeX key.
- Searching via `hash` could also be used to set static links on the
current page, e.g., to filter specific co-authors, venues, etc.
- I don't know much about the design of the input field. I simply reused
the newsletter box style.
- Entering a search term in the box does exact matching. No fuzzy
search, no AND/OR logic. I kept it very simple. Maybe anyone else wants
to improve it in the future.
- The search looks in all data in the BibTeX entry that is parsed via
`bib.liquid`. E.g., it is possible to search for BibTeX keys, titles,
authors, years, venues, abstracts, or whatever `bib.liquid` prints.
- I used a 300ms delay before starting to search on the input box.
- Entering search terms in the box does not update the location hash
(things could get complex otherwise due to automatically updating each
other...)
- If the filter does not find any match in a specific year, the year is
also made invisible.
**Screenshot**
<img width="935" alt="screenshot"
src="https://github.com/alshedivat/al-folio/assets/1998723/447003e2-c623-4de9-b2c5-2357117a7743">
Looking for feedback.
CheariX