docs: general correction across all the pages

docs: update the titles for all files

docs: add a note about response body

docs: improve wording, style, and use more visual ways

docs: updating `fetcher choosing` page and some corrections

docs: updating the `Fetcher Basics` and the `HTTP requests` pages

docs: update the renamed argument

docs: update docs to add file downloading examples

docs: Update docs accordingly and some adjustments

docs: update `fetchers choosing` page

docs: update `fetchers choosing` page

docs: update `fetchers choosing` page

First version of Scrapling full documentation