Several enhancements and bug fixes (#981)

* Update the installation section.

* Fix storage_pyramid.png

* Update the landing page.

* Update index.md

* Add download buttons to the landing page.

* Update the button style.

* Update .gitignore

overrides/partials/content.html

@@ -1,25 +1,3 @@
-<!--
-  Copyright (c) 2016-2023 Martin Donath <martin.donath@squidfunk.com>
-
-  Permission is hereby granted, free of charge, to any person obtaining a copy
-  of this software and associated documentation files (the "Software"), to
-  deal in the Software without restriction, including without limitation the
-  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
-  sell copies of the Software, and to permit persons to whom the Software is
-  furnished to do so, subject to the following conditions:
-
-  The above copyright notice and this permission notice shall be included in
-  all copies or substantial portions of the Software.
-
-  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-  FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
-  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
-  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
-  IN THE SOFTWARE.
--->
-
 <!-- Tags -->
 {% if "material/tags" in config.plugins and tags %}
   {% include "partials/tags.html" %}
@@ -28,14 +6,6 @@
 <!-- Actions -->
 {% include "partials/actions.html" %}
 
-<!--
-  Hack: check whether the content contains a h1 headline. If it doesn't, the
-  page title (or respectively site name) is used as the main headline.
--->
-{% if "\x3ch1" not in page.content %}
-  <h1>{{ page.title | d(config.site_name, true)}}</h1>
-{% endif %}
-
 <!-- Page content -->
 {{ page.content }}