removed description of base and logictools in Welcome to Pynq notebook
removed description of base and logictools in Welcome to Pynq notebook

yunqu/PYNQ,yunqu/PYNQ,Xilinx/PYNQ,cathalmccabe/PYNQ,cathalmccabe/PYNQ,cathalmccabe/PYNQ,cathalmccabe/PYNQ,Xilinx/PYNQ,cathalmccabe/PYNQ,schelleg/PYNQ,Xilinx/PYNQ,Xilinx/PYNQ,yunqu/PYNQ,schelleg/PYNQ,Xilinx/PYNQ,yunqu/PYNQ,yunqu/PYNQ,schelleg/PYNQ,cathalmccabe/PYNQ,schelleg/PYNQ,schelleg/PYNQ