Duckduckgo-search

1) bugfix in images(): httpx.Client(verify=False) to get around an unexpected error in httpx

1) text(backend="api"): extract json from html,
2) bugfix text(backend="html"): update Referer in headers,
3) removed tests for text(backend="lite") - works only with proxies.

1) text(backend="html"/"lite"): removed ad results,
2) README: added exceptions, removed unnecessary async examples.

1) add core exceptions,
2) remove retries in _get_url(),
3) raise ApiException if resp.status_code==403,
4) raise RateLimitException if resp.status_code==202,
5) sleep(0.75) between API requests if proxies is None,
6) sort imports, lint and format .py files with Ruff,
7) pytest: sleep(1) between tests,
9) add "Accept-Encoding" to HEADERS,

1) BUGFIX text(): skip resp if resp.status_code==202,
2) BUGFIX images(): add the "Accept-Language" parameter to the headers.

1) BUGFIX in images() function: add "Accept" parameter to requests,
2) update requirements to use httpx 0.25.1 version (Add support for Python 3.12).