doxygen: Remove qmake files

docs/docs.pro

@@ -1,42 +0,0 @@
-# SPDX-FileCopyrightText: Copyright (C) swift Project Community / Contributors
-# SPDX-License-Identifier: CC0-1.0
-
-load(common_pre)
-
-TEMPLATE = lib
-CONFIG += staticlib
-CONFIG -= qt
-
-OTHER_FILES += Doxyfile.qmake
-OTHER_FILES += src/*.dox
-OTHER_FILES += src/wiki/*.dox
-
-win32: DOXYGEN_BIN = $$system($$(SYSTEMROOT)\system32\where doxygen 2> nul)
-else: DOXYGEN_BIN = $$system(which doxygen 2> /dev/null)
-
-!isEmpty(DOXYGEN_BIN) {
-    DOXYFILE = Doxyfile.qmake
-    DOXY_INPUT = .
-    win32-g++ {
-        doxy.commands  = set DOXY_SRC_ROOT=$$SourceRoot &
-        doxy.commands += doxygen $$PWD/$$DOXYFILE
-    }
-    else:win32 {
-        doxy.commands  = set DOXY_SRC_ROOT=$$SourceRoot &
-        doxy.commands += doxygen $$PWD\\$$DOXYFILE
-    }
-    else {
-        doxy.commands  = DOXY_SRC_ROOT="$$SourceRoot"
-        doxy.commands += doxygen $$PWD/$$DOXYFILE
-    }
-
-    doxy.CONFIG = no_link target_predeps
-    doxy.depends = $$PWD/$$DOXYFILE
-    doxy.input = DOXY_INPUT
-    doxy.name = DOXY
-    doxy.output = html/index.html
-
-    QMAKE_EXTRA_COMPILERS += doxy
-}
-
-load(common_post)