docs: Remove non-showcase Hugo sites

I.e. sites with no mention of Hugo or hugo etc. in the HTML source.

Fixes #2655

docs/content/showcase/arianv.md

@@ -1,14 +0,0 @@
----
-lastmod: 2015-08-04
-date: 2015-02-06T12:51:00Z
-description: ""
-license: ""
-licenseLink: ""
-sitelink: http://arianv.com
-sourceLink: https://github.com/Secretmapper/arianv/tree/master
-tags:
-- personal
-- blog
-thumbnail: /img/arianv-tn.png
-title: Arian's Portfolio
----

docs/content/showcase/arqueart.md

@@ -1,11 +0,0 @@
----
-lastmod: 2015-08-05
-date: 2015-08-01T09:00:00Z
-description: Brazilian Architecture Office.
-sitelink: http://www.arqueart.com/
-tags:
-- business
-- corporate
-thumbnail: /img/arqueart-tn.jpg
-title: arqueart.com
----

docs/content/showcase/chimera-art-space.md

@@ -1,15 +0,0 @@
----
-lastmod: 2015-01-27
-date: 2013-10-02T07:32:00Z
-description: ""
-license: CC-SA
-licenseLink: ""
-sitelink: http://chimeraarts.org/
-sourceLink: https://github.com/chimera/chimeraarts.org
-tags:
-- company
-- bootstrap
-thumbnail: /img/chimera-tn.jpg
-title: Chimera Art Space
----
-

docs/content/showcase/gig.md

@@ -1,12 +0,0 @@
----
-lastmod: 2015-09-14
-date: 2015-08-24T07:32:00Z
-description: "GreenITGlobe website"
-sitelink: http://www.greenitglobe.com/
-tags:
-- company
-- website
-thumbnail: /img/gig.jpg
-title: greenitglobe.com
----
-

docs/content/showcase/gophercon.md

@@ -1,13 +0,0 @@
----
-lastmod: 2015-05-25
-date: 2013-10-01T07:32:00Z
-description: ""
-license: MIT
-licenseLink: ""
-sitelink: http://gophercon.com
-tags:
-- conference
-thumbnail: /img/gophercon-tn.jpg
-title: GopherCon
----
-

docs/content/showcase/hackmeeting.md

@@ -1,15 +0,0 @@
----
-lastmod: 2014-08-26
-date: 2014-08-25T18:30:40-04:00
-description: the website developed for the Hackmeeting 2014, the italian meeting of the digital countercultures held this year in Bologna
-license: Unknown
-licenseLink: ""
-sitelink: http://it.hackmeeting.org/
-sourceLink: https://git.autistici.org/void/hackit14
-tags:
-- foundation5
-- conference
-thumbnail: /img/hackmeeting-tn.jpg
-title: hackmeeting
----
-

docs/content/showcase/heyitsalex.md

@@ -1,15 +0,0 @@
----
-lastmod: 2015-01-27
-date: 2014-03-09T06:00:00Z
-description: ""
-license: MIT
-licenseLink: ""
-sitelink: http://heyitsalex.net/
-sourceLink: https://github.com/alexandre-normand/alexandre-normand
-tags:
-- personal
-- blog
-thumbnail: /img/heyitsalex-tn.jpg
-title: Hey, it's Alex
----
-

docs/content/showcase/humboldtux.md

@@ -1,14 +0,0 @@
----
-lastmod: 2015-09-08
-date: 2015-09-06T18:32:00Z
-description: Humboldtux personal website.
-license: ""
-licenseLink: ""
-sitelink: http://www.humboldtux.net/
-sourceLink: https://github.com/humboldtux/humboldtux.github.io
-tags:
-- personal
-- blog
-thumbnail: /img/humboldtux-tn.png
-title: humboldtux.net
----

docs/content/showcase/ifup.md

@@ -1,14 +0,0 @@
----
-lastmod: 2015-01-27
-date: 2013-11-02T07:32:00Z
-description: ""
-license: MIT
-licenseLink: ""
-sitelink: http://ifup.org/
-tags:
-- personal
-- blog
-thumbnail: /img/ifup-tn.jpg
-title: ifup
----
-

docs/content/showcase/javaunion.md

@@ -1,15 +0,0 @@
----
-lastmod: 2016-01-20
-date: 2016-01-20T01:28:16+08:00
-description: "Java Union provide java tutorials for java beginer and you can run java program online"
-license: ""
-licenseLink: ""
-sitelink: http://www.javaunion.com/
-tags:
-- tutorials
-- java
-- online compile and run 
-- many examples
-thumbnail: /img/javaunion-tn.png
-title: Java Union
----

docs/content/showcase/kangkona.md

@@ -1,15 +0,0 @@
----
-lastmod: 2015-12-13
-date: 2015-06-04T12:51:00Z
-description: Grey Times
-license: Apache License
-licenseLink: "http://www.apache.org/licenses/LICENSE-2.0"
-sitelink: http://kangkona.github.io/
-sourceLink: https://github.com/kangkona/kangkona.github.com
-tags:
-- personal
-- blog
-- foundation
-thumbnail: /img/kangkona-tn.png
-title: Grey Times
----

docs/content/showcase/learnoverpass.md

@@ -1,14 +0,0 @@
----
-lastmod: 2015-07-09
-date: 2015-06-06T12:51:00Z
-description: LearnOverpass is the definitive, one stop learning resource for the overpass API
-license: MIT License
-licenseLink: "http://opensource.org/licenses/MIT"
-sitelink: http://osmlab.github.io/learnoverpass/
-sourceLink: https://github.com/osmlab/learnoverpass
-tags:
-- documentation
-- foundation
-thumbnail: /img/learnoverpass-tn.png
-title: LearnOverpass
----

docs/content/showcase/webstudylist.md

@@ -1,16 +0,0 @@
----
-lastmod: 2016-01-21
-date: 2016-01-21T23:33:01Z
-description: Overview of knowledge and educational resources available online
-license: ""
-licenseLink: ""
-sitelink: http://webstudylist.com/
-tags:
-- study
-- learn
-- education
-- courses
-- resources
-thumbnail: /img/webstudylist-tn.png
-title: Web Study List
----