Update CI, prettierignore, and README wording

Minor repository tweaks: use consistent double quotes in the spellcheck workflow name, disable VALIDATE_NATURAL_LANGUAGE in the super-linter workflow, add .cspell.json to .prettierignore to avoid formatting the spellcheck config, and change README text to refer to the localStorage API.

Author: coliff

.github/workflows/spellcheck.yml

@@ -1,5 +1,5 @@
 ---
-name: 'Check spelling'
+name: "Check spelling"
 on:
   push:
     branches: [main]

.github/workflows/super-linter.yml

@@ -40,3 +40,4 @@ jobs:
           VALIDATE_HTML_PRETTIER: false
           VALIDATE_JSCPD: false
           VALIDATE_MARKDOWN: false
+          VALIDATE_NATURAL_LANGUAGE: false

.prettierignore

@@ -1 +1,2 @@
-*.min.*
+*.min.*
+.cspell.json

README.md

@@ -9,7 +9,7 @@
 
 Add a dark-mode theme toggle with a Bootstrap Custom Switch.
 
-- Uses local storage to save preference
+- Uses localStorage to save preference
 - Only 383 Bytes minified and gzipped!
 
 ## Quick start