Provided custom meta descriptions for each page and post

Signed-off-by: Jim Martens <github@2martens.de>

pages/404.html

@@ -1,6 +1,7 @@
 ---
 title: 404 - Link not found
 permalink: /404.html
+description: The link you have tried to access, doesn't exist.
 ---
 
 <div class="container my-3">

pages/cv.html

@@ -2,6 +2,7 @@
 title: Curriculum Vitae
 permalink: /cv/
 sidebarboxes: cv-pdf job_offers encrypted-communication
+description: On this page you can find my curriculum vitae.
 ---
 
 {% if site.data.author.image %}

pages/datenschutzerklärung.html

@@ -1,6 +1,7 @@
 ---
 title: Datenschutzerklärung
 permalink: /datenschutz/
+description: Die Datenschutzerklärung für diese Website kann hier gefunden werden.
 ---
 
 For your convenience there is an <a href="{{ site.baseurl }}{% link pages/privacy-policy.html %}">English version</a> available.

pages/impressum.html

@@ -1,6 +1,7 @@
 ---
 title: Impressum
 permalink: /impressum/
+description: Das Impressum für diese Website kann hier gefunden werden.
 ---
 
 For your convenience there is an <a href="{{ site.baseurl }}{% link pages/legal-notice.html %}">English version</a> available.

pages/legal-notice.html

@@ -1,6 +1,7 @@
 ---
 title: Legal Notice
 permalink: /legal-notice/
+description: The legal notice for this website can be found here.
 ---
 
 <h2>Information provided according to Sec. 5 German Telemedia Act (TMG):</h2>

pages/privacy-policy.html

@@ -1,6 +1,7 @@
 ---
 title: Privacy Policy
 permalink: /privacy-policy/
+description: The privacy policy for this website can be found here.
 ---
 
 <h2>Data Protection</h2>

pages/snowden-refugees.html

@@ -2,6 +2,7 @@
 title: Snowden Refugees
 permalink: /snowden-refugees/
 sidebarboxes: snowden-refugees encrypted-communication
+description: The Snowden Refugees helped Edward Snowden in 2013. They had nothing and gave everything. Here you can find out how to help them.
 ---
 
 <p>