Flatten repo structure: move crawler/ to root, remove vqa/ and immoweb/

The crawler subdirectory was the only active project. Moving it to the
repo root simplifies paths and removes the unnecessary nesting. The
vqa/ and immoweb/ directories were legacy/unused and have been removed.

Updated .drone.yml, .gitignore, .claude/ docs, and skills to reflect
the new flat structure.

crawler/.style.yapf

@@ -1,21 +0,0 @@
-[style]
-based_on_style = facebook
-
-# Formatting options
-column_limit = 88
-indent_width = 4
-use_tabs = false
-continuation_indent_width = 4
-
-# Spacing
-spaces_around_power_operator = true
-spaces_before_comment = 2
-
-# Splitting rules
-split_before_logical_operator = true
-split_before_bitwise_operator = true
-split_before_arithmetic_operator = true
-split_before_expression_after_opening_paren = true
-split_before_first_argument = false
-split_complex_comprehension = true
-allow_split_before_dict_value = true