use more consistent url path names

src/main.zig

···
         var router = try server.router(.{});
         router.get("/", getIndex, .{});
         router.get("/assets/:type/:name", getAsset, .{});
-        router.get("/channel/:channel", getChannel, .{});
-        router.get("/channel/:channel/messages", getChannelMessages, .{});
-        router.post("/channel", goToChannel, .{});
+        router.get("/channels/:channel", getChannel, .{});
+        router.get("/channels/:channel/messages", getChannelMessages, .{});
+        router.post("/channels", goToChannel, .{});
         router.get("/channels", getChannels, .{});
 
         log.info("HTTP server listening on http://localhost:8080", .{});
···
         defer list.deinit(res.arena);
 
         for (ctx.channels.keys()) |name| {
-            const html_item = try std.fmt.allocPrint(res.arena, "<li><a href=\"/channel/{s}\">{s}</a></li>", .{ name[1..], name });
+            const html_item = try std.fmt.allocPrint(res.arena, "<li><a href=\"/channels/{s}\">{s}</a></li>", .{ name[1..], name });
             try list.appendSlice(res.arena, html_item);
         }
 
···
 
         if (channel) |ch| {
             if (ctx.hasChannel(ch)) {
-                const url = try std.fmt.allocPrint(res.arena, "/channel/{s}", .{ch});
+                const url = try std.fmt.allocPrint(res.arena, "/channels/{s}", .{ch});
                 res.status = 302;
                 res.header("Location", url);
                 return;

src/public/html/index.html

···
     </header>
     <main>
       <h1>Welcome to Apollo</h1>
-      <form action="/channel" method="post" hx-boost="true">
+      <form action="/channels" method="post" hx-boost="true">
         <label for="channel-name">Channel name:</label>
         <input id="channel-name" name="channel-name" type="text" placeholder="Channel name" required>
         <p><small></small></p>