Use hard-coded colors for category chips

To match the colors of categories in the client, we should use a hard-coded list of colors for all category chips in Repomaker. As far as I can see this affects the following pages: app details, app edit, add from repos, remote app details (#138 (closed)).

This is the list of colors:

Connectivity CBEFEC

Development E2D6BC
Games F3B569
Graphics F65A5A
Internet 73EABC
Money DDDDD0
Multimedia FF7F66
Navigation 94D6FD
Phone and SMS F3CFC0
Reading D6A07A
Science & Education F4F4EC
Security FFD15F
Sports & Health ADCEDE
System D3DB77
Theming DEEFE9
Time FF7043
Writing F2E9CE

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