kurifilter-plugins: remove docbook provider

uses external search engine and most of the links on the page (which was
last updated in 2016 according to the date at the bottom) lead elsewhere

Signed-off-by: Ivailo Monev <xakepa10@gmail.com>

kurifilter-plugins/ikws/searchproviders/docbook.desktop

@@ -1,99 +0,0 @@
-[Desktop Entry]
-Charset=
-Hidden=false
-Keys=db,docbook
-Name=DocBook - The Definitive Guide
-Name[af]=Docbook - Die Definitiewe Gids
-Name[ar]=كتاب توثيق - الدليل الكامل
-Name[as]=DocBook - The Definitive Guide
-Name[ast]=DocBook - La guía definitiva
-Name[be]=DocBook - Падручнік
-Name[be@latin]=Padrabiazny padručnik pa „DocBook”
-Name[bg]=DocBook - The Definitive Guide
-Name[bn]=ডকবুক - দি ডেফিনিটিভ গাইড
-Name[bn_IN]=DocBook - বর্ণনামূলক সহায়িকা
-Name[bs]=Dokbuk: konačni vodič
-Name[ca]=DocBook: La guia definitiva
-Name[ca@valencia]=DocBook - La guia definitiva
-Name[cs]=DocBook - The Definitive Guide
-Name[csb]=DocBook (systema dokùmentacëji) - pòdrãcznik
-Name[cy]=DocBook - Y Canllaw Awdurdodol
-Name[da]=DocBook - den definitive guide
-Name[de]=DocBook – The Definitive Guide
-Name[el]=DocBook - Ο απόλυτος οδηγός
-Name[en_GB]=DocBook - The Definitive Guide
-Name[eo]=DocBook - La definitiva manlibro
-Name[es]=DocBook - La guía definitiva
-Name[et]=DocBook - The Definitive Guide
-Name[eu]=DocBook - The Definitive Guide
-Name[fa]=DocBook - راهنمای صریح
-Name[fi]=DocBook – The Definitive Guide
-Name[fr]=Docbook - le guide ultime
-Name[fy]=DocBook - The Definitive Guide
-Name[ga]=DocBook - The Definitive Guide
-Name[gl]=DocBook, a guía completa
-Name[gu]=ડોકબુક - ધ ડેફિનેટીવ ગાઇડ
-Name[he]=DocBook - המדריך האולטימטיבי
-Name[hi]=डॉकबुक - निर्णायक मार्गदर्शक
-Name[hne]=डाकबुक - निर्नायक मार्गदर्सक
-Name[hr]=DocBook – Definitivni vodič
-Name[hsb]=DocBook - The Definitive Guide
-Name[hu]=DocBook - The Definitive Guide
-Name[ia]=DocBook - Le Guida Definitive
-Name[id]=DocBook - Panduan Definitif
-Name[is]=DocBook - Opinbera handbókin
-Name[it]=DocBook - La guida definitiva
-Name[ja]=DocBook - 完全ガイド
-Name[ka]=DocBook - განსაზღვრებები
-Name[kk]=DocBook - толық бағыттамасы
-Name[km]=DocBook - មគ្គុទ្ទេសក៍​ច្បាស់លាស់
-Name[kn]=ಡಾಕ್ಬುಕ್- ಪ್ರಮಾಣಭೂತ ಮಾರ್ಗದರ್ಶಕ
-Name[ko]=DocBook - 명확한 가이드
-Name[ku]=DockBook - Rêberê Bê Kêmasî
-Name[lt]=DocBook –  galutinis vadovas
-Name[lv]=DocBook - izsmeļošs ceļvedis
-Name[mai]=डाकबुक - निर्णायक मार्गदर्शक
-Name[mk]=DocBook - дефинитивниот водач
-Name[ml]=ഡോക്ബുക്ക് - തര്‍ക്കമില്ലാത്ത പഠനസഹായി
-Name[mr]=डॉकबुक - निर्णायक मार्गदर्शिका
-Name[ms]=DocBook - Panduan Definitif
-Name[nb]=DocBook – Den endelige guiden
-Name[nds]=DocBook - De Inföhren
-Name[ne]=DocBook - निर्णायक मार्गदर्शक
-Name[nl]=DocBook - The Definitive Guide
-Name[nn]=DocBook – The Definitive Guide
-Name[or]=DocBook - ବର୍ଣ୍ଣନାତ୍ମକ ମାର୍ଗ ଦର୍ଶକ
-Name[pa]=DocBook - ਨਿਸ਼ਚਿਤ ਗਾਈਡ
-Name[pl]=DocBook (system dokumentacji) - podręcznik
-Name[pt]=DocBook - O Guia Definitivo
-Name[pt_BR]=DocBook - o guia definitivo
-Name[ro]=DocBook - Ghidul de referință
-Name[ru]=Полное руководство по DocBook
-Name[se]=DocBook – The Definitive Guide
-Name[si]=DocBook - The Definitive Guide
-Name[sk]=DocBook - The Definitive Guide
-Name[sl]=DocBook - Popolni vodnik
-Name[sr]=Докбук: коначни водич
-Name[sr@ijekavian]=Докбук: коначни водич
-Name[sr@ijekavianlatin]=DocBook: konačni vodič
-Name[sr@latin]=DocBook: konačni vodič
-Name[sv]=Den slutgiltiga guiden till docbook
-Name[ta]=Docபுத்தகம் - விளக்கமான வழிகாட்டி
-Name[te]=DocBook - నిర్ధారిత మార్గదర్శి
-Name[tg]=DocBook - Роҳнамои сарнавишт
-Name[th]=DocBook - The Definitive Guide
-Name[tr]=DocBook - Eksiksiz Rehber
-Name[ug]=DocBook - نوپۇزلۇق يېتەكچى
-Name[uk]=Посібник визначень DocBook
-Name[uz]=DocBook - toʻliq qoʻllanma
-Name[uz@cyrillic]=DocBook - тўлиқ қўлланма
-Name[vi]=DocBook - Hướng dẫn Đầy đủ
-Name[wa]=DocBook - Li seu guide
-Name[xh]=DocBook - Incwadi Echazayo
-Name[x-test]=xxDocBook - The Definitive Guidexx
-Name[zh_CN]=DocBook - 权威指南
-Name[zh_TW]=DocBook - 終極指南
-Query=https://docbook.org/tdg/en/html/\\{1}.html
-Query[x-test]=xxhttps://docbook.org/tdg/en/html/\\{1}.htmlxx
-X-KDE-ServiceTypes=SearchProvider
-Type=Service