documentation theme updates (#713)

Co-authored-by: Zois Pagoulatos <zpagoulatos@hotmail.com>

docs/index.md

@@ -1,3 +1,6 @@
+<p style="text-align: center; margin-left: 1.6rem;">
+  <img src="./images/logo-450px.png" width="450" />
+</p>
 <h1 align="center">
   Watchtower
 </h1>
@@ -29,12 +32,12 @@
   <a href="https://www.codacy.com/app/simskij/watchtower?utm_source=github.com&utm_medium=referral&utm_content=containrrr/watchtower&utm_campaign=Badge_Coverage">
     <img alt="Codacy Badge" src="https://api.codacy.com/project/badge/Coverage/3a4d0fcfd26d45b09b1d7ea3c8c13744" />
   </a>
-  <a href="https://gitter.im/containrrr/watchtower?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge">
-    <img alt="Join the chat at https://gitter.im/containrrr/watchtower" src="https://badges.gitter.im/containrrr/watchtower.svg" />
-  </a>
   <a href="#contributors">
     <img alt="All Contributors" src="https://img.shields.io/badge/all_contributors-30-orange.svg?style=flat-square" />
   </a>
+  <a href="https://hub.docker.com/r/containrrr/watchtower">
+    <img alt="Pulls from DockerHub" src="https://img.shields.io/docker/pulls/containrrr/watchtower.svg?style=flat-square" />
+  </a>
 </p>
 
 ## Quick Start
@@ -46,4 +49,4 @@ $ docker run -d \
     --name watchtower \
     -v /var/run/docker.sock:/var/run/docker.sock \
     containrrr/watchtower
-```
+```

docs/stylesheets/theme.css

@@ -0,0 +1,16 @@
+[data-md-color-scheme="containrrr"] {
+    --md-primary-fg-color: #406170;
+    --md-primary-fg-color--light:#acbfc7;
+    --md-primary-fg-color--dark: #003343;
+    --md-accent-fg-color: #003343;
+    --md-accent-fg-color--transparent: #00334310;
+}
+
+.md-header-nav__button.md-logo {
+    padding: 0;
+}
+
+.md-header-nav__button.md-logo img {
+    width: 1.6rem;
+    height: 1.6rem;
+}

mkdocs.yml

@@ -3,10 +3,17 @@ site_url: http://containrrr.github.io/watchtower/
 repo_url: https://github.com/containrrr/watchtower/
 theme:
   name: 'material'
+  palette:
+    scheme: containrrr
+  logo: images/logo-450px.png
+  favicon: images/favicon.ico
+extra_css:
+  - stylesheets/theme.css
 markdown_extensions:
     - toc:
         permalink: True
         separator: "_"
+    - codehilite
 nav:
    - 'Home': 'index.md'
    - 'Introduction': 'introduction.md'