Removed unused ubuntu fonts (from old pdf generation).

openslides/core/static/fonts/README.txt

@@ -1,16 +0,0 @@
-This directory contains truetype fonts which are used for PDF generation in OpenSlides.
-They are registered in the file 'openslides/utils/pdf.py'.
-
-The Ubuntu font is available in three styles: Regular, Bold and Italic.
-
-If you want to use your own font just replace the Ubuntu font with your truetype font files.
-Or you have to change the filename in the registerFont function in pdf.py. Please note
-that the font name 'Ubuntu' is already used in some stylesheets in the same file.
-
-The font file circle.ttf contains only the unicode character 'HEAVY LARGE CIRCLE' (U+2B55)
-which is extracted from the free unicode font "Quivira 4.0" [1] with the freeware
-OpenType font editor "Type light" [2]. The circle glyph is mapped to the '*' character
-for using in OpenSlides PDF ballot papers of motions and elections.
-
-[1] http://www.quivira-font.com/
-[2] http://www.cr8software.net/typelight.html