remove deprecated doc generation stuff

* remove "doc" target from legacy makefile based build
* remove doxygen templates no more used
* removed pdoc3 .mako files (we now re-use pdoc)

makefiles/Makefile.doc.mk

@@ -1,44 +0,0 @@
-# Copyright 2010-2025 Google LLC
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# Generate documentation
-.PHONY: help_doc # Generate list of Documentation targets with descriptions.
-help_doc:
-	@echo Use one of the following Documentation targets:
-	@$(GREP) "^.PHONY: .* #" $(CURDIR)/makefiles/Makefile.doc.mk | $(SED) "s/\.PHONY: \(.*\) # \(.*\)/\1\t\2/" | expand -t20
-	@echo
-
-
-# Main target
-.PHONY: doc # Create doxygen and python documentation.
-doc: doxy-doc python-doc java-doc
-
-.PHONY: doxy-doc # Create doxygen ref documentation.
-doxy-doc: cpp python java dotnet
-	bash -c "command -v doxygen"
-	python3 tools/doc/gen_ref_doc.py
-
-.PHONY: java-doc # Create Javadoc ref documentation.
-java-doc: java
-	bash -c "command -v mvn"
-	tools/doc/gen_javadoc.sh
-
-.PHONY: python-doc # Create python documentation.
-python-doc: python
-	bash -c "command -v pdoc"
-	$(SET_PYTHONPATH) pdoc \
- --logo https://developers.google.com/optimization/images/orLogo.png \
- -o docs/python/ \
- --no-search -d google \
- --footer-text "OR-Tools ${OR_TOOLS_MAJOR}.${OR_TOOLS_MINOR}" \
- build_make/python/ortools