Preparing new 9.1.0 release.
Improved the search form.
get the search param filters
Simplified deployment section.
Fixed CSS menu class in article template.
Uses Bootstrap4 for the pagination component generated by Flask-Pagination.
fixed some JavaScript to like/unlike an article from the home page.
removed unused imports
removed unused variable
Added SQLite configuration file.
added a way to specify a configuration file via an environment variable
fixed issues reported by flake8.
Added flake8 in dev requirements.