Feat/llm config (#724)

* feature: Add LlmConfig to easily configure and pass LLM configs to different strategies

* pulled in next branch and resolved conflicts

* feat: Add gemini and deepseek providers. Make ignore_cache in llm content filter to true by default to avoid confusions

* Refactor: Update LlmConfig in LLMExtractionStrategy class and deprecate old params

* updated tests, docs and readme

tests/docker/test_docker.py

@@ -7,6 +7,7 @@ from crawl4ai import (
     BrowserConfig, CrawlerRunConfig, DefaultMarkdownGenerator,
     PruningContentFilter, JsonCssExtractionStrategy, LLMContentFilter, CacheMode
 )
+from crawl4ai.async_configs import LlmConfig
 from crawl4ai.docker_client import Crawl4aiDockerClient
 
 class Crawl4AiTester:
@@ -142,7 +143,7 @@ async def test_with_client():
             cache_mode=CacheMode.BYPASS,
             markdown_generator=DefaultMarkdownGenerator(
                 content_filter=LLMContentFilter(
-                    provider="openai/gpt-40",
+                    llmConfig=LlmConfig(provider="openai/gpt-40"),
                     instruction="Extract key technical concepts"
                 )
             ),