diff --git a/_layouts/website/summary.html b/_layouts/website/summary.html
deleted file mode 100644
index 958ec916c23b001239fdb369fcb4540a682b54fb..0000000000000000000000000000000000000000
--- a/_layouts/website/summary.html
+++ /dev/null
@@ -1,57 +0,0 @@
-{% macro articles(_articles) %}
-    {% for article in _articles %}
-        <li class="chapter {% if article.path == file.path and not article.anchor %}active{% endif %}" data-level="{{ article.level }}" {% if article.path %}data-path="{{ article.path|resolveFile }}"{% endif %}>
-            {% if article.path and getPageByPath(article.path) %}
-                <a href="{{ article.path|resolveFile }}{{ article.anchor }}">
-            {% elif article.url %}
-                <a target="_blank" href="{{ article.url }}">
-            {% else %}
-                <span>
-            {% endif %}
-                    {% if article.level != "0" and config.pluginsConfig['theme-default'].showLevel %}
-                        <b>{{ article.level }}.</b>
-                    {% endif %}
-                    {{ article.title }}
-            {% if article.path  or article.url %}
-                </a>
-            {% else %}
-                </span>
-            {% endif %}
-
-            {% if article.articles.length > 0 %}
-            <ul class="articles">
-                {{ articles(article.articles, file, config) }}
-            </ul>
-            {% endif %}
-        </li>
-    {% endfor %}
-{% endmacro %}
-
-<ul class="summary">
-    {% set _divider = false %}
-    {% if config.links.sidebar  %}
-    {% for linkTitle, link in config.links.sidebar  %}
-        {% set _divider = true %}
-        <li>
-            <a href="{{ link }}" target="_blank" class="custom-link">{{ linkTitle }}</a>
-        </li>
-    {% endfor %}
-    {% endif %}
-
-    {% if _divider %}
-    <li class="divider"></li>
-    {% endif %}
-
-    {% for part in summary.parts %}
-        {% if part.title %}
-        <li class="header">{{ part.title }}</li>
-        {% elif not loop.first %}
-        <li class="divider"></li>
-        {% endif %}
-        {{ articles(part.articles, file, config) }}
-    {% endfor %}
-    <li class="divider"></li>
-    <li>
-      <a href="https://gitlab.kwant-project.org/solidstate/lectures/issues/new?issuable_template=typo">Report a typo</a>
-    </li>
-</ul>
diff --git a/book.json b/book.json
deleted file mode 100644
index 592f658bbe5cb6a69c2b3fbe9138bcb4cc827e76..0000000000000000000000000000000000000000
--- a/book.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-    "plugins": ["katex-plus", "-sharing"]
-}