[server][client] Changes room pattern from :id-:name to :id/:name

Because `-` is allowed in URLs and in names for servers, I was seeing routing
issues with rooms that had dashes in their names. I don't have direct control
over the Mint router (unless I fork Mint) to change whether it uses eg greedy vs
non-greedy matching on routes, so I think the way to avoid this is to change the
room patern (this commit) and then URLencode room names (to handle cases where
rooms have eg a slash in their name; left for later work)

client/source/Main.mint

@@ -7,18 +7,18 @@ routes {
     }
   }
 
-  /room/:id-:name?key=:key (id: String, name: String, key: String) {
+  /room/:id/:name?key=:key (id: String, name: String, key: String) {
     try {
       Application.initialize()
       Application.acceptInvite({room = {id = id, name = name}, key = key})
-      Window.navigate("/room/#{id}-#{name}")
+      Window.navigate("/room/#{id}/#{name}")
       Result::Ok(id)
     } catch Storage.Error => error {
       Result::Err(error)
     }
   }
 
-  /room/:id-:name (id: String, name: String) {
+  /room/:id/:name (id: String, name: String) {
     sequence {
       Application.initialize()
       Messages.loadForRoom(id)

client/source/Rooms.mint

@@ -58,7 +58,7 @@ component Rooms {
         |> Maybe.toResult("")
       data = decode object as RoomKey
       Application.acceptInvite(data)
-      Window.navigate("/room/#{data.room.id}-#{data.room.name}")
+      Window.navigate("/room/#{data.room.id}/#{data.room.name}")
     } catch Http.ErrorResponse => error {
       sequence {
         Debug.log(error)
@@ -90,7 +90,7 @@ component Rooms {
       "Join a room"
       <ul>
         for (roomKey of data) {
-          <li><a href="/room/#{roomKey.room.id}-#{roomKey.room.name}"><{ roomKey.room.name }></a></li>
+          <li><a href="/room/#{roomKey.room.id}/#{roomKey.room.name}"><{ roomKey.room.name }></a></li>
         }
       </ul>
       <a::createRoom(true) href="#" onClick={startCreating}>"+ Create a room"</a>

client/source/Top.mint

@@ -62,7 +62,7 @@ component Top {
         |> Maybe.toResult("")
       data = decode object as RoomKey
       next {
-        currentInvite = Maybe::Just("#{protocol}://#{`window.location.host`}/room/#{data.room.id}-#{data.room.name}?key=#{data.key}")
+        currentInvite = Maybe::Just("#{protocol}://#{`window.location.host`}/room/#{data.room.id}/#{data.room.name}?key=#{data.key}")
       }
       Result::Ok(response.body)
     } catch Http.ErrorResponse => error {

server/src/server.cr

@@ -22,7 +22,7 @@ get "/" do |env|
   send_file env, "public/index.html"
 end
 
-get "/room/:id-:name" do |env|
+get "/room/:id/:name" do |env|
   send_file env, "public/index.html"
 end