Fix for mobile layout on firefox (#956)

related to the vuepress issue with the mobile layout removing viewport meta tags on firefox for Android.

Fix is to explicity define it.

vuejs/vuepress#2369

Co-authored-by: Kgothatso Ngako <[email protected]>

Author: kngako

docs/.vuepress/config.js

@@ -20,6 +20,7 @@ module.exports = {
   title,
   description: "BTCPay Server Official Documentation",
   head: [
+    ['meta', { name: "viewport", content: "width=device-width, initial-scale=1.0"}],
     ["link", { rel: "stylesheet", href: "/styles/btcpayserver-variables.css" }]
   ],
   chainWebpack (config) {