Update front page, stressing open source and open development

index.html

@@ -12,10 +12,10 @@
     - label: '<i class="fas fa-download"></i> Install v{% include root_stable_version %}'
       url: /install
 feature_row:
-  - title: '<img src="assets/images/histoIcon.svg" alt="*.*" width="59" height="59">'
+  - title: '<img src="assets/images/histoIcon.svg" alt="*.*" width="65" height="65">'
     excerpt: "ROOT enables <i>statistically sound</i> scientific analyses and visualization of large amounts of data: today, more than 1 exabyte (1,000,000,000 gigabyte) are stored in ROOT files. [The Higgs was found with ROOT!](gallery#higgs-plots)"
-  - title: '<img src="assets/images/globe_with_meridians.svg" alt="*.*">'
-    excerpt: "As <i>high-performance</i> software, ROOT is written mainly in C++. You can use it on Linux, macOS, or Windows; it works out of the box. ROOT is [open source](about/license): use it freely, [modify it](install/build_from_source), [contribute to it](contribute)!"
+  - title: '<img src="assets/images/code.svg" alt="*.*" width="65" height="65">'
+    excerpt: "ROOT is [open source](about/license), which means that you can use it freely and [modify it](install/build_from_source). It adopts an open development process, inviting [its users to contribute to it](contribute)."
   - title: '$ _'
     excerpt: "ROOT comes with an [incredible C++ interpreter](primer#learn-c-at-the-root-prompt), ideal for <i>fast prototyping</i>. Don't like C++? ROOT integrates super-smoothly with Python thanks to its [unique dynamic and powerful Python &#8644; C++ binding](manual/python/). Or what about [using ROOT in a Jupyter notebook](https://nbviewer.jupyter.org/url/root.cern/doc/master/notebooks/rf301_composition.C.nbconvert.ipynb)?"
 ---