Introduce the sqlite3 database

• Pdfsearch now stores the search index in a sqlite database instead of a file. This reduces memory usage associated with serialization and deserialization on program start up.
• We utilize the sqlite3 Full Text Search extension (FTS5) to perform the search and ranking.
• We remove the old search functions and unused cli flags.
• We replaced the page.html to use embed instead of object(depracated)

Version 0.0.3

• Book are listed on their own page
• Search package refactored for ease of maintenance
• Ignore Index pages in search results

Version 0.0.2

• This version makes a few changes to the User interface.
• Reduces memory usage during building the index and searching
• C API has been refactored into separate files.

v0.0.1

First Beta version