Update Ruby icon

[why]
Improve legibility by having gaps between the gemstone surfaces.

[how]
There is no official monochrome icon. Found one free pixel one and
converted that to outline.

Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>

src/svgs/icons.tsv

@@ -25,7 +25,8 @@
 008		i_seti_play_arrow
 009		i_seti_sass				sass.svg
 010		i_seti_rails				rails.svg
-011		i_seti_ruby				ruby.svg
+011		i_custom_ruby				ruby_nf.svg
+011		i_seti_ruby
 012		i_seti_python				python.svg
 013		i_seti_heroku				heroku.svg
 014		i_seti_php				php.svg

src/svgs/ruby_nf.svg

@@ -0,0 +1 @@
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