Blog post for v1.0.3 release (#5275)

* Blog post for v1.0.3 release

* Update blog link in front page

* Remove badge for 1.0.0 announcement

docs/_posts/2017-01-23-leaflet-1.0.3.md

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+---
+layout: post
+title: Announcing Leaflet 1.0.3
+description: Leaflet 1.0.3, a bugfix release, is out
+author: Iván Sánchez Ortega
+authorsite: http://ivan.sanchezortega.es
+---
+
+Leaflet 1.0.3 is now out, with about a dozen bugfixes since 1.0.2.
+
+One of the main highlights is the handling of `dblblick` events for web browsers
+which support [`PointerEvent`s](https://developer.mozilla.org/en-US/docs/Web/API/PointerEvent).
+Until now, the only browser which used `PointerEvent`s were Internet Explorer and Edge;
+but now that Chrome has [enabled support in version 55](https://developers.google.com/web/updates/2016/11/nic55#pointer-events),
+the Leaflet code for checking for double clicks and touchscreens had to change.
+
+Leaflet 1.0.3 also improved the performance and behaviour of `L.Canvas` rendering,
+backported a few fixes for Internet Explorer 8, and some miscellaneous fixes.
+
+The full list of changes can be found on [the changelog](https://github.com/Leaflet/Leaflet/blob/master/CHANGELOG.md).
+
+
+As usual, check the [downloads page](http://leafletjs.com/download.html) to get this release.
+
+
+Cheers,<br>
+The Leaflet team.

docs/index.html

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 layout: v2
 ---
 
-<div class="announcement">Nov 21, 2016 — <a href="http://leafletjs.com/2016/11/21/leaflet-1.0.2.html">Leaflet 1.0.2</a>, a bugfix release, is out.</div>
-
-<div class="announcement">Sep 27, 2016 — <a href="http://leafletjs.com/2016/09/27/leaflet-1.0-final.html">Leaflet 1.0</a>, the fastest, most stable and polished Leaflet release ever, is finally out!</div>
+<div class="announcement">Jan 23, 2017 — <a href="http://leafletjs.com/2016/11/21/leaflet-1.0.3.html">Leaflet 1.0.3</a>, a bugfix release, is out.</div>
 
 <p>Leaflet is the leading open-source JavaScript library for mobile-friendly interactive maps.
 Weighing just about <abbr title="33 KB gzipped &mdash; that's 123 KB minified and 218 KB in the source form, with 10 KB of CSS (2 KB gzipped) and 11 KB of images.">33 KB of JS</abbr>,