[TASK] Adopt the shared .editorconfig

.editorconfig

@@ -1,30 +1,32 @@
-# EditorConfig is awesome: http://EditorConfig.org
-#
-# Use as master: https://github.com/TYPO3-Documentation/T3DocTeam/blob/main/.editorconfig
+# EditorConfig is awesome: https://EditorConfig.org
+
+# Master copy, used unchanged by every TYPO3 documentation repository:
+# https://github.com/TYPO3-Documentation/TYPO3CMS-Guide-HowToDocument
 
-# top-most EditorConfig file
 root = true
 
-[{*.rst,*.rst.txt}]
+# Code examples indent two spaces, whatever the language, so that a nested
+# example still fits the line length the prose around it is wrapped to
+[*]
 charset = utf-8
 end_of_line = lf
+indent_style = space
+indent_size = 2
 insert_final_newline = true
 trim_trailing_whitespace = true
-indent_style = space
+
+# reStructuredText is the exception: one indentation level is four spaces
+[{*.rst,*.rst.txt}]
 indent_size = 4
 max_line_length = 80
 
-# MD-Files
 [*.md]
-charset = utf-8
-end_of_line = lf
-insert_final_newline = true
-trim_trailing_whitespace = true
-indent_style = space
-indent_size = 4
 max_line_length = 80
 
-# Makefile
-[{Makefile,**.mk}]
-# Use tabs for indentation (Makefiles require tabs)
+# Makefiles do not work without real tabs
+[{Makefile,_Makefile,**.mk}]
 indent_style = tab
+
+# In a patch a leading or trailing space is content, not whitespace
+[*.diff]
+trim_trailing_whitespace = false