Update installation instructions for non-npm usage

In [this post](https://adactio.com/links/20512), @adactio notes:

> I just wish the installation didn’t assume that you’re using npm …it’s not really “zero dependency” if it depends on that.

Easy enough! This commit adds a brief sentence on how to download a copy of table-saw without using npm or other package management tooling.

README.md

@@ -38,7 +38,9 @@ A small structural-only zero-dependency Web Component for responsive `<table>` e
 
 ## Installation
 
-Install via [npm on `@zachleat/table-saw`](https://www.npmjs.com/package/@zachleat/table-saw).
+For a truly zero-dependency experience, [download a tagged version](https://github.com/zachleat/table-saw/tags) and follow [the usage instructions above](#examples).
+
+Or, install via [npm on `@zachleat/table-saw`](https://www.npmjs.com/package/@zachleat/table-saw).
 
 ```sh
 npm install @zachleat/table-saw
@@ -50,4 +52,4 @@ npm install @zachleat/table-saw
 * Works with viewport media queries or container queries.
 * Uses CSS grid for small viewport alignment.
 * Falls back to regular table before or without JavaScript.
-* Cuts the mustard on [`CSSStyleSheet.prototype.replaceSync`](https://caniuse.com/mdn-api_cssstylesheet_replacesync)
+* Cuts the mustard on [`CSSStyleSheet.prototype.replaceSync`](https://caniuse.com/mdn-api_cssstylesheet_replacesync)