webhooks/taiga: Migrate docs to Markdown.

zerver/webhooks/taiga/doc.md

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+{!create-stream.md!}
+
+{!create-bot-construct-url.md!}
+
+{!append-topic.md!}
+
+Make sure to specify the topic in the URL above. Otherwise, the
+default topic `General` will be used.
+
+Remember to URL-encode the stream and topic names in the above
+URL. Spaces need to be replaced with `%20`. For instance, if
+you want your stream to be called "My awesome project", it
+should be encoded as `My%20awesome%20project`.
+
+Since Taiga allows you to integrate services on a per project
+basis, you have to perform the following steps for *every project*
+that you want to send notifications to Zulip.
+
+1. Go to **Admin** > **Integration** > **Webhooks** menu.
+
+2. Click **Add a new webhook**.
+
+3. Fill out the form by following the instructions:
+    * **Name** - to recognize this service, preferably `Zulip`
+    * **URL** - the URL we created above
+    * **Secret key** - once again the bot API key created in Zulip
+
+4. Click **Save** once you've finished filling out the form.
+
+{!congrats.md!}
+
+![](/static/images/integrations/taiga/001.png)
+
+There are **two different ways** you may want to consider
+when organizing your Taiga - Zulip integration:
+
+* Use a separate Zulip stream for Taiga messages - name it `taiga`
+  (as recommended above). For every integrated project, provide a
+  new topic in the URL as described above.
+
+* If you already have a Zulip stream for managing a project,
+  you can also use this existing stream and provide `Taiga`
+  as the topic in the URL.