Adding rss feed to track RDMkit news

Currently it lists the last 10 posts in the news section. This would allow people the get notified when a new page is added.
To do:

[x] Check if link is the correct one (currently the GitHub PR since we don't have separate pages for each news item)
[x] Add an rss feed icon to link out towards the rss feed
Example:

<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0"
    xmlns:atom="http://www.w3.org/2005/Atom"
    xmlns:dc="http://purl.org/dc/elements/1.1/"
    xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
>
    <channel>
        <title>RDMkit</title>
        <description>Best practices and guidelines you can use for FAIR management of your research data.</description>     
        <sy:updatePeriod>daily</sy:updatePeriod>
        <sy:updateFrequency>1</sy:updateFrequency>
        <link>http://localhost:4000</link>
        <atom:link href="http://localhost:4000/feed.xml" rel="self" type="application/rss+xml" />
        <lastBuildDate>Wed, 24 Nov 2021 00:00:00 +0100</lastBuildDate>
            <item>
                <title>Improved TeSS links</title>
                <description>Due to a Converge WP2-WP3 hackathon, we improved many links towards TeSS to ensure that people are linked to relevant trainings.</description>
                <pubDate>Wed, 24 Nov 2021 00:00:00 +0100</pubDate>
                <link>https://github.com/elixir-europe/rdmkit/pull/755</link>
                <guid isPermaLink="true">https://github.com/elixir-europe/rdmkit/pull/755</guid>
            </item>
            <item>
                <title>The history button</title>
                <description>Next to the edit me button you will now also find a history button to discover when the latest changes were made on this page.</description>
                <pubDate>Mon, 29 Nov 2021 00:00:00 +0100</pubDate>
                <link>https://github.com/elixir-europe/rdmkit/pull/767</link>
                <guid isPermaLink="true">https://github.com/elixir-europe/rdmkit/pull/767</guid>
            </item>
            <item>
                <title>New section: National resources</title>
                <description>We have from now on a dedicated place on this website to list country specific research data management resources! [Discover the section here](national_resources).</description>
                <pubDate>Fri, 10 Dec 2021 00:00:00 +0100</pubDate>
                <link>https://github.com/elixir-europe/rdmkit/pull/749</link>
                <guid isPermaLink="true">https://github.com/elixir-europe/rdmkit/pull/749</guid>
            </item>
            <item>
                <title>Linking to FAIR Cookbook</title>
                <description>We increase the interoperability of our website by adding official support for linking towardsFAIR cookbook for in depth recipes about some data management topics.</description>
                <pubDate>Fri, 19 Nov 2021 00:00:00 +0100</pubDate>
                <link>https://github.com/elixir-europe/rdmkit/pull/759</link>
                <guid isPermaLink="true">https://github.com/elixir-europe/rdmkit/pull/759</guid>
            </item>
            <item>
                <title>New page: Machine actionability</title>
                <description>A &quot;your task&quot; page about the meaning of machine actionability in life sciences RDM. [Discover the page here](machine_actionability).</description>
                <pubDate>Thu, 04 Nov 2021 00:00:00 +0100</pubDate>
                <link>https://github.com/elixir-europe/rdmkit/pull/715</link>
                <guid isPermaLink="true">https://github.com/elixir-europe/rdmkit/pull/715</guid>
            </item>
            <item>
                <title>New page: Bioimaging data</title>
                <description>A &quot;your domain&quot; page about Bioimaging. [Discover the page here](bioimaging_data).</description>
                <pubDate>Tue, 14 Dec 2021 00:00:00 +0100</pubDate>
                <link>https://github.com/elixir-europe/rdmkit/pull/765</link>
                <guid isPermaLink="true">https://github.com/elixir-europe/rdmkit/pull/765</guid>
            </item>
            <item>
                <title>Linking with DSW</title>
                <description>RDMkit will from now on automatically add links to the converge knowledge model on the Data Stewardship Wizard (DSW), where relevant. This is based on existing links towards RDMkit in DSW.</description>
                <pubDate>Fri, 28 Jan 2022 00:00:00 +0100</pubDate>
                <link>https://github.com/elixir-europe/rdmkit/pull/803</link>
                <guid isPermaLink="true">https://github.com/elixir-europe/rdmkit/pull/803</guid>
            </item>
            <item>
                <title>New page: National resources Finland</title>
                <description>This page gives an insight in RDM on national level in Finland. [Discover the page here](fi_resources)</description>
                <pubDate>Mon, 24 Jan 2022 00:00:00 +0100</pubDate>
                <link>https://github.com/elixir-europe/rdmkit/pull/816</link>
                <guid isPermaLink="true">https://github.com/elixir-europe/rdmkit/pull/816</guid>
            </item>
            <item>
                <title>New page: National resources Germany</title>
                <description>This page gives an insight in RDM on national level in Germany. [Discover the page here](de_resources)</description>
                <pubDate>Fri, 21 Jan 2022 00:00:00 +0100</pubDate>
                <link>https://github.com/elixir-europe/rdmkit/pull/812</link>
                <guid isPermaLink="true">https://github.com/elixir-europe/rdmkit/pull/812</guid>
            </item>
            <item>
                <title>New page: National resources Norway</title>
                <description>This page gives an insight in RDM on national level in Norway. [Discover the page here](no_resources)</description>
                <pubDate>Fri, 14 Jan 2022 00:00:00 +0100</pubDate>
                <link>https://github.com/elixir-europe/rdmkit/pull/792</link>
                <guid isPermaLink="true">https://github.com/elixir-europe/rdmkit/pull/792</guid>
            </item>
    </channel>
</rss>
Requested by @sitjart
elixir-europe / rdmkit

Adding rss feed to track RDMkit news #1466

To do:

Example:
