Update server

views/error.pug

@@ -0,0 +1,8 @@
+extends base
+
+block content
+    section.section
+        .container
+            .message.is-danger
+                .message-header An error occured
+                .message-body= message

views/upload.pug

@@ -1,14 +1,42 @@
 extends base
+
 block content
     section.section
         .container
             .columns.is-centered
-                .column.is-narrow.is-desktop
+                .column.is-6.is-desktop
                     form(action="upload-target", method="POST", encType="multipart/form-data")
                         .field
                             label.label Name
+                            p.content.has-text-justified
+                                | This name will be the name you will see on
+                                | the leaderboard.  It also corresponds to the
+                                | name of the module your AI will be on the
+                                | server.
+                            p.content.has-text-justified
+                                | You can use an already exisiting name to
+                                | replace it with a new version of your AI.
+                            p.content.has-text-justified
+                                | You could also erase other people's AI, but
+                                | please, don't do it, because I would be sad
+                                | 😢
                             input.input(type="text", name="name", placeholder="Name of your AI")
                         .field
+                            label.label Archive
+                            p.content.has-text-justified
+                                | The archive to upload needs to contain a file
+                                | named <code>ai.py</code> which must contain a
+                                | class named <code>Ai</code> which must contain
+                                | a constructor that takes no arguments (other
+                                | than self or optional arguments).
+                            p.content.has-text-justified
+                                | It may also contain more files, such as
+                                | binary files with neural network weights, or
+                                | such as other python modules.
+                            p.content.has-text-justified
+                                | Please note that this archive must not
+                                | contain a directory, it must only contain the
+                                | files.
                             .file.has-name
                                 label.file-label
                                     input.file-input(type="file", name="archive")
@@ -17,6 +45,6 @@ block content
                                             i.fas.fa-upload
                                         span.file-label Choose a file…
                                     span.file-name
-                        .control
-                            button.button.is-link Submit
+                        .field
+                            input.button.is-link(type="submit", value="Submit")