integration-docs: Update the RSS integration doc.

Author: Niloth-p

zulip/integrations/rss/doc.md

@@ -1,26 +1,83 @@
-Get service alerts, news, and new blog posts right in Zulip with our
-RSS integration!
+# Zulip RSS Integration
+
+Get service alerts, news, and new blog posts right in Zulip!
 
 !!! tip ""
 
-    Note that [the Zapier integration][1] is usually a simpler way to
+    [The Zapier integration][1] is usually a simpler way to
     integrate RSS with Zulip.
 
 [1]: ./zapier
 
-1.  {!create-channel.md!}
+{start_tabs}
 
 1.  {!create-an-incoming-webhook.md!}
 
+    Download the `zuliprc` configuration file of your bot by clicking the
+    download (<i class="fa fa-download"></i>) icon under the bot's name, and
+    save to `~/.zuliprc`.
+
 1.  {!download-python-bindings.md!}
 
-1.  The RSS integration will be installed to a location like
-    `/usr/local/share/zulip/integrations/rss/rss-bot`.
+1.  {!install-requirements.md!}
+
+1.  Create an RSS feed file containing 1 feed URL per line at
+    `~/.cache/zulip-rss/rss-feeds`. To use a different location, pass the
+    `--feed-file` [option](#configuration-options) to the integration
+    script.
+
+1.  You can run the bot to send summaries of RSS entries from your favorite
+    feeds, with the command:
+
+    `{{ integration_path }}/rss-bot`
+
+1.  Optionally, pass command-line arguments to re-configure the integration.
+
+    ```
+    {{ integration_path }}/rss-bot \
+    --feed-file="home/user/zulip-rss/rss-feeds" \
+    --data-dir="home/user/zulip-rss" \
+    --stream="news" \
+    --topic="rss" \
+    --unwrap --math
+    ```
+
+    See [the configuration options](#configuration-options) for the list of
+    options.
+
+1.  Configure a crontab entry to keep the integration running.
+
+    This sample crontab entry processes feeds stored in the default
+    location and posts to the "rss" topic in the "news" stream every 5
+    minutes:
 
-1.  Follow the instructions in the `rss-bot` script for configuring the
-    bot, adding your subscriptions, and setting up a cron job to run
-    the bot.
+    `*/5 * * * * {{ integration_path }}/rss-bot --stream="news" --topic="rss"`
+
+{end_tabs}
 
 {!congrats.md!}
 
 ![RSS bot message](/static/images/integrations/rss/001.png)
+
+### Configuration options
+
+The integration script accepts the following command-line arguments.
+
+- `--feed-file`: The path to the file containing the RSS feed URLs. The
+  default location is `~/.cache/zulip-rss/rss-feeds`.
+
+- `--data-dir`: The directory where feed metadata is stored. The default
+  location is `~/.cache/zulip-rss`.
+
+- `--stream`: The name of the Zulip channel you want to receive
+  notifications in. By default, messages are sent to the `rss` channel.
+
+- `--topic`: The name of the topic to which the RSS entries will be posted.
+  By default, each feed source in the feed file will post to its own topic
+  named after the feed title.
+
+- `--unwrap`: This option converts word-wrapped paragraphs in the RSS
+  entries' bodies into single lines.
+
+- `--math`: This option converts `$` in the RSS entries' bodies to `$$`, for
+  KaTeX processing.