refactor: migrate versioning to __version__.py and remove deprecated _version.py

crawl4ai/__init__.py

@@ -2,7 +2,7 @@
 
 from .async_webcrawler import AsyncWebCrawler
 from .models import CrawlResult
-from ._version import __version__
+from .__version__ import __version__
 # __version__ = "0.3.73"
 
 __all__ = [

crawl4ai/async_webcrawler.py

@@ -16,7 +16,7 @@ from .utils import (
     InvalidCSSSelectorError,
     format_html
 )
-from ._version import __version__ as crawl4ai_version
+from .__version__ import __version__ as crawl4ai_version
 
 class AsyncWebCrawler:
     def __init__(

crawl4ai/content_filter_strategy.py

@@ -1,12 +1,7 @@
-import os
 import re
-import time
 from bs4 import BeautifulSoup, Tag
 from typing import List, Tuple, Dict
 from rank_bm25 import BM25Okapi
-import nltk
-from time import perf_counter
-from html5lib import parse, treebuilders
 from time import perf_counter
 from collections import deque
 from bs4 import BeautifulSoup, NavigableString, Tag