update gitignore

.gitignore

@@ -11,40 +11,39 @@
 # *.sdc
 
 # ignore Quartus II generated folders
-*_sim
-db
-greybox_tmp
-incremental_db
-simulation
-testbench
-timing
+**/*_sim/
+**/db/
+**/greybox_tmp/
+**/incremental_db/
+**/simulation/
+**/testbench/
+**/timing/
 
 # ignore Quartus II generated files
-*_generation_script*
-*_inst.vhd
-*.bak
-*.cmp
-*.done
-*.eqn
-*.hex
-*.html
-*.jdi
-*.jpg
-*.mif
-*.pin
-*.pof
-*.ptf.*
-*.qar
-*.qarlog
-*.qws
-*.rpt
-*.smsg
-*.sof
-*.sopc_builder
-*.summary
-*.tcl
-*.txt # Explicitly add any text files used
-*~
-*example*
-*sopc_*
-PLLJ_PLLSPE_INFO.txt # The generated PLL specification file
+**/*_generation_script*
+**/*_inst.vhd
+**/*.bak
+**/*.cmp
+**/*.done
+**/*.eqn
+**/*.hex
+**/*.html
+**/*.jdi
+**/*.jpg
+**/*.mif
+**/*.pin
+**/*.pof
+**/*.ptf.*
+**/*.qar
+**/*.qarlog
+**/*.qws
+**/*.rpt
+**/*.smsg
+**/*.sof
+**/*.sopc_builder
+**/*.summary
+**/*.tcl
+**/*.txt # Explicitly add any text files used
+**/*example*
+**/*sopc_*
+**/PLLJ_PLLSPE_INFO.txt # The generated PLL specification file