Replace pypi version badge badge.fury.io -> img.shields.io

badge was blocked by privacy badger due to third party cookie.
Replace with one that doesn't use cookies.

Also add some other badges I may want to implement:

  supported python versions
  licenses used
  status beta, stable etc.
  mozilla observatory

Author: rouilj

website/www/index.txt

@@ -19,12 +19,18 @@ Roundup Issue Tracker
 .. raw:: html
 
    <div class="release_info note">
+   <!-- package version/pypi download -->
    <a
       href="https://pypi.org/project/roundup/#files">Download:
      <img style="vertical-align: text-top"
-     src="https://badge.fury.io/py/roundup.svg?color=lightblue"
+     src="https://img.shields.io/pypi/v/roundup?color=blue&label=Current%20Version&cacheSeconds=86400"
       alt="PyPI version" height="18"></a>
-   <!--  <img src="https://shields.io/pypi/pyversions/roundup"> -->
+   <!-- supported python versions: <img src="https://shields.io/pypi/pyversions/roundup"> -->
+   <!-- license: <img src="https://img.shields.io/pypi/l/roundup"> -->
+   <!-- changes since 2.2.0 <img src="https://img.shields.io/github/commits-since/roundup-tracker/roundup/2.2.0/master?sort=semver"> -->
+   <!-- status beta, stable, mature.... <img src="https://img.shields.io/pypi/status/roundup"> -->
+   <!-- mozilla observatory <img src="https://img.shields.io/mozilla-observatory/grade/www.roundup-tracker.org?publish"> -->
+   <!-- downloads/month -->
    <a style="display:block; margin-block-start: 1em; text-align:
    center;" href="https://pypistats.org/packages/roundup" alt="">
    <img