drop .editorconfig - use only .prettier config file

.editorconfig

@@ -1,19 +0,0 @@
-# Remember that the prettier config will take prececence over .editorconfig
-# When using the prettier plugin and commandline tool.
-root = true
-
-[*]
-indent_style = space
-indent_size = 2
-charset=utf-8
-trim_trailing_whitespace = true
-insert_final_newline = true
-
-[*.yml]
-indent_style = space
-indent_size = 2
-tab_width = 4
-end_of_line = lf
-
-[*.md]
-trim_trailing_whitespace = false