add some comments to filter_with_lists and add a basic test

Merge branch 'rolling' into feat-error-box-for-engine-errors

Merge branch 'rolling' into feat-error-box-for-engine-errors

✨ feat: optimise search results filtering code (#163)

🧹 chore: make rustfmt happy

✨ feat: rename functions (#163)

✨ feat: move implementation of config file path to reduce duplication (#163)

✨ feat: rename public_paths to paths (#163)

✨ feat: add code to filter aggregated search results using lists (#163)

fix debug level not being set properly

fix dumb rustfmt version and bump dependency versions

Improve aggregation

Improve Aggregation function & config parser

Use non-blocking sleep function

✨ feat: add images, error_box & new message when no results are provided (#185)

Merge branch 'rolling' into improve-results-caching

🔧 chore: add code to cache the previous & next pages (#160)

Merge branch 'improve-logging-based-on-levels-and-opts' of github.com:neon-mmd/websurfx into improve-logging-based-on-levels-and-opts

🔧 chore: fix link in the logs & add logs for engine error (#170)

Merge branch 'rolling' into improve-logging-based-on-levels-and-opts

Merge branch 'rolling' into patch-csrf-security-with-cors

🔧 chore: improve logging based on levels & config options (#173)

🛠️ fix: add code to prevent csrf attacks using cors (#172)

✨ feat: fix doc tests

✨ feat: add control check to avoid reinitializing logging & fix tests

✨ feat: remove space from the end of the line

✨ feat: add new config option to manage threads and improve logging

Merge branch 'rolling' into patch-searx-results-on-first-page

🛠️ fix: add & improve code to handle page handling in searx & duckduckgo

✨ feat: improve code documentation

🧹 chore: reformat code to make rustfmt happy

✨ feat: provide the functionality to use the new config option

✨ feat: provide functionality to parse the new config option

✨ feat: add documentation for the `outputs.iter()` code block

✨ feat: rename `results_json` to `results`

✨ feat: remove the empty_result_set option and helper functions

✨ feat: fix spelling mistake in the comment

✨ feat: rephrase the comment to break it into smaller sentences.

Merge branch 'rolling' into improve-async-multithreading

✨ feat: add documentation to code

✨ feat: add check to conditionaly pass empty_result_set to true to UI

✨ feat: add code to pass engine errors to the UI

✨ feat: add setter functions to SearchResults struct

✨ feat: fix code for clippy suggestions

✨ feat: add code to parse cookies and handle engine selection from UI

✨ feat: define common behaviour for all engines

✨ feat: remove the time crate import

✨ feat: fix bugs and add code to handle engine selections

✨ feat: implement async multithreading and engine selection code

✨ feat: fix the argument type used