refactor: Standardize inventory data and naming conventions

This commit refactors the product inventory data to be a flat, single array. This design improves data versatility and scalability for various site functions.

- Flattened the data structure for easier filtering and searching.
- Atomized product attributes, such as `productNumber` and `skuID`.
- Standardized variable and object key naming to `camelCase` and `UPPERCASE_SNAKE_CASE` for constants.
- Added an `isFeatured` flag to products to enable dynamic content on the homepage.
- Implemented a meta tag in the base template to control search engine indexing on a per-page basis.

src/_includes/base.njk

@@ -4,6 +4,9 @@
         <meta charset="UTF-8">
         <meta name="viewport" content="width=device-width, initial-scale=1.0">
         <meta name="description" content="{{ metaDesc }}">
+        {% if seoIndexing === false %}
+            <meta name="robots" content="noindex">
+        {% endif %}
 
         <title>{{title}}</title>
 
@@ -35,8 +38,6 @@
 
         {% include "footer.njk" %}
 
-<!-- <a href="https://www.svgbackgrounds.com/set/free-svg-backgrounds-and-patterns/">Free SVG Backgrounds and Patterns by SVGBackgrounds.com</a> -->
-
         {% if pageScripts %}
             {% for script in pageScripts %}
                 <script src="{{ script }}"></script>