Put mails in toggles

Closes #10

commands/merge_requests.py

@@ -35,11 +35,13 @@ class MergeRequests(BaseGitCommand):
         commit(f'"Add sources ({submission.branch} {submission.login})"')
         push("origin", submission.branch)
 
+        mail = f"<details>\n<summary>Mail</summary>\n\n<pre>{submission.get_mail()}</pre></details>"
+
         self.gitlab.post_mr(
             source_branch=submission.branch,
             target_branch="master",
             title=f"[{submission.homework}{'-opravne' if submission.correction else ''}] {submission.login}",
-            description=submission.get_mail(),
+            description=mail,
             labels=submission.homework,
             remove_source_branch="true",
             assignee_ids=["1772"],