Overhaul tooling, linting, editor configs, and README

.editorconfig

@@ -0,0 +1,15 @@
+root = true
+
+[*]
+end_of_line = lf
+charset = utf-8
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
+
+[*.{feature,json,md,yaml,yml,toml}]
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false