pidgin/nest

Remove hacky pluginTable data, and use a uniq array slice instead

Credit goes here: https://discourse.gohugo.io/t/reduce-data-into-a-different-format-and-create-markup-from-the-new-format/22591/2?u=oiyouyeahyou

Plus, fix bug that leaves an empty string in the search types set
{
"gplugin": "bitbucket.org/gplugin/gplugin/",
"libgnt": "bitbucket.org/pidgin/libgnt/",
"nest": "bitbucket.org/pidgin/nest/",
"pidgin": "bitbucket.org/pidgin/main/",
"plugin-pack": "bitbucket.org/pidgin/purple-plugin-pack/",
"talkatu": "bitbucket.org/pidgin/talkatu/",
"www": "bitbucket.org/pidgin/www/"
}