help-docs: Move help center documentation to top level directory.

These files are not Jinja2 templates, so there's no reason that they needed
to be inside `templates/zerver`. Moving them to the top level reflects their
importance and also makes it feel nicer to work on editing the help center content, 
without it being unnecessary buried deep in the codebase.

help/edit-a-bot.md

@@ -0,0 +1,40 @@
+# Edit a bot
+
+Zulip lets you edit the properties of any bot for which you are the owner.
+Organization [administrators](/help/roles-and-permissions) can also edit any
+active bot in the organization.
+
+## Edit your bot
+
+{start_tabs}
+
+{settings_tab|your-bots}
+
+1. Click the **pencil** (<i class="fa fa-pencil"></i>) icon on the profile
+   card for the bot you want to edit.
+
+1. Edit bot information as desired, and click **Save changes**.
+
+{end_tabs}
+
+## Edit a bot in your organization
+
+{!admin-only.md!}
+
+{start_tabs}
+
+{settings_tab|bot-list-admin}
+
+1. In the **Actions** column, click the **pencil** (<i class="fa fa-pencil"></i>)
+   icon for the bot you want to edit.
+
+1. Edit bot information as desired, and click **Save changes**.
+
+{end_tabs}
+
+## Related articles
+
+* [Bots and integrations](/help/bots-and-integrations)
+* [Add a bot or integration](/help/add-a-bot-or-integration)
+* [Deactivate or reactivate a bot](/help/deactivate-or-reactivate-a-bot)
+* [View all bots in your organization](/help/view-all-bots-in-your-organization)