Distribute prebuilt binaries via the npm registry #3750

- Remove all custom download logic for prebuilt binaries
- Add scripts to populate package contents
- Specify minimum versions of common package managers
- Remove sharp.vendor runtime API as no-longer relevant
- Update installation docs and issue templates

lib/utility.js

@@ -3,13 +3,11 @@
 
 'use strict';
 
-const fs = require('fs');
-const path = require('path');
 const events = require('events');
 const detectLibc = require('detect-libc');
 
 const is = require('./is');
-const platformAndArch = require('./platform')();
+const { runtimePlatformArch } = require('./libvips');
 const sharp = require('./sharp');
 
 /**
@@ -55,25 +53,14 @@ let versions = {
   vips: sharp.libvipsVersion()
 };
 try {
-  versions = require(`../vendor/${versions.vips}/${platformAndArch}/versions.json`);
-} catch (_err) { /* ignore */ }
+  versions = require(`@sharpen/sharp-${runtimePlatformArch()}/versions`);
+} catch (_) {
+  try {
+    versions = require(`@sharpen/sharp-libvips-${runtimePlatformArch()}/versions`);
+  } catch (_) {}
+}
 versions.sharp = require('../package.json').version;
 
-/**
- * An Object containing the platform and architecture
- * of the current and installed vendored binaries.
- * @member
- * @example
- * console.log(sharp.vendor);
- */
-const vendor = {
-  current: platformAndArch,
-  installed: []
-};
-try {
-  vendor.installed = fs.readdirSync(path.join(__dirname, `../vendor/${versions.vips}`));
-} catch (_err) { /* ignore */ }
-
 /**
  * Gets or, when options are provided, sets the limits of _libvips'_ operation cache.
  * Existing entries in the cache will be trimmed after any change in limits.
@@ -280,7 +267,6 @@ module.exports = function (Sharp) {
   Sharp.format = format;
   Sharp.interpolators = interpolators;
   Sharp.versions = versions;
-  Sharp.vendor = vendor;
   Sharp.queue = queue;
   Sharp.block = block;
   Sharp.unblock = unblock;