add sample page data
Add _extract_wikipedia_text_from_wikipedia_page() to extract the lines between <text> and </text>
Add _clean_notice_notation_from_text() to erase the notice representations before a wikipedia text
add _delete_file_notation() to delete mediawiki notation to represent a link text of a file
add _delete_table_notation() to delete mediawiki notation to represent a table
add _delete_table_notation() to delete mediawiki notation to represent a table
Add clean_linke_notation() to extract an anchor text
add test cases for clean_link_notation()