docs: update chat URLs due to Element transition

Author: Planeshifter

README.md

@@ -723,7 +723,7 @@ Test and build infrastructure is generously provided by the following services:
 
 [chat-image]: https://img.shields.io/gitter/room/stdlib-js/stdlib.svg
 
-[chat-url]: https://gitter.im/stdlib-js/stdlib/
+[chat-url]: https://app.gitter.im/#/room/#stdlib-js_stdlib:gitter.im
 
 [make]: https://www.gnu.org/software/make/
 

docs/links/database.json

@@ -9343,7 +9343,7 @@
       "gotoblas2"
     ]
   },
-  "https://gitter.im/stdlib-js/stdlib/": {
+  "https://app.gitter.im/#/room/#stdlib-js_stdlib:gitter.im": {
     "id": "chat-url",
     "description": "stdlib chat room.",
     "short_url": "",

lib/node_modules/@stdlib/_tools/scripts/publish_packages.js

@@ -502,7 +502,7 @@ function mainRepoSection( customLicense, branch, hasBundles, hasCLI ) {
 		'-->',
 		'',
 		'[chat-image]: https://img.shields.io/gitter/room/stdlib-js/stdlib.svg',
-		'[chat-url]: https://gitter.im/stdlib-js/stdlib/',
+		'[chat-url]: https://app.gitter.im/#/room/#stdlib-js_stdlib:gitter.im',
 		'',
 		'[stdlib]: https://github.com/stdlib-js/stdlib',
 		'',