Add a script to target the git-snapshots releases

Previously, the Git for Windows snapshots were hosted on Azure Blobs.
Now they are hosted in GitHub releases in the
https://github.com/git-for-windows/git-snapshots repository.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

adjust-hrefs.js

@@ -0,0 +1,22 @@
+#!/usr/bin/env node
+
+(async () => {
+  const fs = require('fs')
+  const lines = fs.readFileSync('index.html', 'utf-8').split('\n')
+
+  let tagName
+  for (let i = 0; i < lines.length; i++) {
+    const match = lines[i].match(/href="(?!GitForWindows\.css|mailto:)(Git-(.*)-64-bit\.exe|[^"\/]+)"/)
+    if (!match) continue
+    if (match[2]) tagName = match[2]
+    lines[i] = lines[i].replace(
+      /href="([^"\/]+)"/g,
+      `href="https://github.com/git-for-windows/git-snapshots/releases/download/${tagName}/$1"`
+    )
+  }
+
+  fs.writeFileSync('index.html', lines.join('\n'))
+})().catch(e => {
+  console.error(e)
+  process.exit(1)
+})