feat: update slider + create

- got rid of commented out css
- update about tab UI
- add reset icon to reset text
- change link colour
- add number to show value on slider
- reorder greeting settings to make a bit more sense

prettierrc

@@ -0,0 +1,7 @@
+{ 
+  "printWidth": 100,
+  "trailingComma": "all",
+  "tabWidth": 2, 
+  "semi": true, 
+  "singleQuote": true
+ }