docs: replace Gitter w/ Zulip and Twitter w/ Bluesky

.github/ISSUE_TEMPLATE/config.yml

@@ -21,8 +21,8 @@ contact_links:
     url:  https://github.com/stdlib-js/stdlib/blob/develop/FAQ.md
     about: Consult the FAQ in case we have already answered your question there.
   - name: 💬 Question
-    url:  https://gitter.im/stdlib-js/stdlib
-    about: Got a (non-bug related) question we haven't already answered? Ask us on Gitter! 🤗
+    url:  https://stdlib.zulipchat.com
+    about: Got a (non-bug related) question we haven't already answered? Ask us on Zulip! 🤗
   - name: 👏 Support Us
     url: https://github.com/stdlib-js/stdlib/blob/develop/docs/support_the_project.md
     about: Want to help support the project? 😍

public/index.html

@@ -291,7 +291,7 @@ <h4 class="title">Open Source</h4>
 			/
 			<a href="/docs/api/latest">Docs</a>
 			/
-			<a href="https://gitter.im/stdlib-js/stdlib">Chat</a>
+			<a href="https://stdlib.zulipchat.com">Chat</a>
 			/
 			<a href="https://blog.stdlib.io">Blog</a>
 			/

src/components/footer/index.jsx

@@ -47,7 +47,7 @@ function Footer( props ) {
 				<span aria-hidden="true"> / </span>
 				<a href={ config.blog } title="Read our blog">Blog</a>
 				<span aria-hidden="true"> / </span>
-				<a href={ config.twitter } title="Follow us on Twitter!">Twitter</a>
+				<a href={ config.bluesky } title="Follow us on Bluesky!">Bluesky</a>
 				<span aria-hidden="true"> / </span>
 				<a href={ config.repository } title="Contribute to stdlib">Contribute</a>
 				<span aria-hidden="true"> / </span>

src/components/readme/print_button.jsx

@@ -93,7 +93,7 @@ class PrintButton extends React.Component {
 		text += 'Copyright (c) 2016-'+( new Date() ).getFullYear()+' The Stdlib Authors.';
 		text += '</p>';
 		text += '<p>';
-		text += 'If you have any questions, please join the discussion on <a href="'+config.gitter+'">Gitter</a>.';
+		text += 'If you have any questions, please join the discussion on <a href="'+config.zulip+'">Zulip</a>.';
 		text += '</p>';
 
 		this._$footer.innerHTML = text;

src/components/welcome/index.jsx

@@ -59,7 +59,7 @@ function Welcome( props ) {
 				<section className="help" aria-label="getting help">
 					<h2>Getting Help</h2>
 					<p>
-						Ask questions and get help from the community on the project's <a href={ config.gitter }>Gitter</a> channel.
+						Ask questions and get help from the community on the project's <a href={ config.zulip }>Zulip</a> channel.
 					</p>
 				</section>
 				<section className="installation" aria-label="installation">