feat(home): clarify 5chan is serverless app, use current hostname for share links

- Homepage infobox: merged copy into single line explaining app nature and download link
- Share links (Copy direct link): use window.location.origin instead of hardcoded 5chan.app
- Settings version link: use current origin
- FAQ: add 'Is 5chan just this website?' entry under Basics
- Remove pleb.bz from CHAN_5_HOSTNAMES

src/views/faq/faq.tsx

@@ -37,6 +37,9 @@ const FAQ = () => {
                     <li>
                       <HashLink to='#what5chan'>What is 5chan?</HashLink>
                     </li>
+                    <li>
+                      <HashLink to='#justwebsite'>Is 5chan just this website?</HashLink>
+                    </li>
                     <ul>
                       <li>
                         <HashLink to='#howaccess'>How do I access the boards?</HashLink>
@@ -93,6 +96,13 @@ const FAQ = () => {
                   it's all text including links from which media is embedded, shared peer-to-peer. Users do not need to register an account before participating in the
                   community.
                 </dd>
+                <dt id='justwebsite'>Is 5chan just this website?</dt>
+                <dd>
+                  No. 5chan is a client app for the Bitsocial protocol. This website is just one place to open it — the domain could change, disappear, or be blocked
+                  without affecting the Bitsocial network or any boards. We recommend installing the app when your browser offers it, so you keep a local copy that works
+                  independently. You can also <a href='https://github.com/bitsocialhq/5chan/releases/latest'>download a desktop or Android release</a> from GitHub. If you
+                  know a board's address, you can connect from any host or installed copy.
+                </dd>
                 <dt id='howaccess'>How do I access the boards?</dt>
                 <dd>
                   Anyone can access any board at a any time by simply knowing its address. Paste it in the search box, located in the homepage or at the top of the board

src/views/home/home.tsx

@@ -67,7 +67,13 @@ const InfoBox = () => {
         />
         <br />
         <br />
-        {t('no_global_rules_info')}
+        <Trans
+          i18nKey='no_global_rules_info'
+          shouldUnescape={true}
+          components={{
+            1: <a key='releases-link' href='https://github.com/bitsocialhq/5chan/releases/latest' target='_blank' rel='noopener noreferrer' />,
+          }}
+        />
       </div>
     </div>
   );