Add EditorConfig and standardize code formatting

Adds an EditorConfig file to maintain consistent coding styles across editors. Reformats code with consistent indentation using spaces instead of tabs. Makes minor color palette adjustments.

.editorconfig

@@ -0,0 +1,45 @@
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+charset = utf-8
+
+# Lua files
+[*.lua]
+indent_style = space
+indent_size = 4
+
+# Vim files
+[*.vim]
+indent_style = space
+indent_size = 2
+
+# Markdown files
+[*.md]
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = false
+
+# YAML files
+[*.{yml,yaml}]
+indent_style = space
+indent_size = 2
+
+# TOML files
+[*.toml]
+indent_style = space
+indent_size = 2
+
+# Shell scripts
+[*.sh]
+indent_style = space
+indent_size = 2
+
+# Config files
+[*.conf]
+indent_style = space
+indent_size = 2