Add new release manual for website

RELEASE.md

@@ -63,7 +63,8 @@ To release a new `<version>` of `kotlinx-coroutines`:
    * Cut & paste lines from [`CHANGES.md`](CHANGES.md) into description.
 
 4. Build and publish the documentation for the web-site: <br>
-   `site/deploy.sh <version> push`
+   * Set new value for [`kotlinx.coroutines.release.tag`](https://buildserver.labs.intellij.net/admin/editProject.html?projectId=Kotlin_KotlinSites_Builds_KotlinlangOrg_LibrariesAPIs&tab=projectParams)
+   * And run deploy [configuration](https://buildserver.labs.intellij.net/buildConfiguration/Kotlin_KotlinSites_Builds_KotlinlangOrg_KotlinCoroutinesApi?branch=%3Cdefault%3E&buildTypeTab=overview&mode=builds)
 
 5. Announce the new release in [Slack](https://kotlinlang.slack.com)
 

redirects.mjs

@@ -0,0 +1,42 @@
+import { cwd } from 'process';
+import { extname, resolve } from 'path';
+import { promises as fsPromises } from 'fs';
+
+const { readdir, writeFile, unlink } = fsPromises
+
+async function* getFiles(dir) {
+    const dirents = await readdir(dir, { withFileTypes: true });
+
+    for (const dirent of dirents) {
+        const { name } = dirent;
+        const fullPath = resolve(dir, name);
+
+        if (dirent.isDirectory()) {
+            yield* getFiles(fullPath);
+        } else {
+            yield { name, fullPath };
+        }
+    }
+}
+
+(async function main() {
+    const cwdpath = cwd();
+    const library = 'kotlinx.coroutines';
+
+    for await (const { name, fullPath } of getFiles(cwdpath)) {
+        if (name === 'navigation.html') await unlink(fullPath);
+        else {
+            const ext = extname(name);
+
+            if (ext === '.html') {
+                let relativeUrl = fullPath.substring(cwdpath.length + 1);
+
+                if (name === 'index.html')
+                    relativeUrl = relativeUrl.substring(0, relativeUrl.length - 'index.html'.length);
+
+                const url = new URL(`/api/${library}/${relativeUrl}`, 'https://kotlinlang.org');
+                await writeFile(fullPath, `<script>window.location = '${url}' + window.location.hash;</script><meta http-equiv="refresh" content="0; url=${url}"/>`);
+            }
+        }
+    }
+})();