Simplified the deployment script

* Implemented yarn run deploy, which deploys all packages to npm, with the same version assigned to all of them.

devEnv/deploy.mjs

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+import path from 'path'
+import {writeFileSync} from 'fs'
+
+/**
+ * This script publishes all packages to npm.
+ *
+ * It assigns the same version number to all packages (like lerna's fixed mode).
+ **/
+// It's written in .mjs because I kept running into issues with zx+typescript
+;(async function () {
+  // our packages will check for this env variable to make sure their
+  // prepublish script is only called from the `$ cd /path/to/monorepo; yarn run deploy`
+  process.env.THEATRE_IS_PUBLISHING = true
+
+  await $`yarn run typecheck`
+
+  syncVersionNumbers()
+
+  return
+
+  await Promise.all(
+    [
+      'theatre',
+      '@theatre/dataverse',
+      '@theatre/dataverse-react',
+      '@theatre/plugin-r3f',
+    ].map((workspace) => $`yarn workspace ${workspace} run build`),
+  )
+
+  await Promise.all(
+    [
+      '@theatre/core',
+      '@theatre/studio',
+      '@theatre/dataverse',
+      '@theatre/dataverse-react',
+      '@theatre/plugin-r3f',
+    ].map(
+      (workspace) => $`yarn workspace ${workspace} npm publish --access public`,
+    ),
+  )
+})()
+
+function syncVersionNumbers() {
+  /**
+   * All these packages will have the same version from monorepo/package.json
+   */
+  const workspaces = [
+    'theatre',
+    'theatre/core',
+    'theatre/studio',
+    'packages/dataverse',
+    'packages/dataverse-react',
+    'packages/plugin-r3f',
+  ]
+
+  const monorepoVersion = require('../package.json').version
+
+  console.log(
+    `sync-versions: Setting versions of all packages to ${monorepoVersion}`,
+  )
+
+  for (const packagePathRelativeFromRoot of workspaces) {
+    const pathToPackage = path.resolve(
+      __dirname,
+      '../',
+      packagePathRelativeFromRoot,
+      './package.json',
+    )
+
+    const original = require(pathToPackage)
+
+    if (original.version !== monorepoVersion) {
+      console.log(`Setting version of ${original.name} to ${monorepoVersion}`)
+
+      const newJson = {...original}
+      newJson.version = monorepoVersion
+      writeFileSync(
+        path.join(pathToPackage),
+        JSON.stringify(newJson, undefined, 2),
+      )
+    }
+  }
+  console.log('sync-versions: Done.')
+}

devEnv/ensurePublishing.js

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+if (process.env.THEATRE_IS_PUBLISHING !== 'true') {
+  throw Error(
+    `This script may run only when the "deploy" command in monorepo's root is running.`,
+  )
+}