Improve SEO in nginx.conf, index.html; update favicon and logos; embedded card now supported; Dockerfile slimmed and modernized

.editorconfig

@@ -0,0 +1,33 @@
+# top-most EditorConfig file
+root = true
+
+# Universal settings for all file types
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+max_line_length = 120
+tab_width = 2
+
+# React & TypeScript
+[*.{ts,tsx,js,jsx}]
+quote_type = single
+
+# Sass & CSS
+[*.{sass,scss,css}]
+insert_final_newline = true
+
+# Webpack configs, Node scripts, and Data files
+[*.{json,jsonc,yml,yaml,cjs,mjs}]
+indent_size = 2
+
+# HTML templates
+[*.{htm,html}]
+indent_size = 2
+
+# Markdown overrides
+[*.{md,markdown,mdc}]
+trim_trailing_whitespace = false