task#5969 create help page
Merge pull request #179 from cuongnv540/task#5969

task#5969 create help page
task#5979 add footer for all page
Merge pull request #182 from tunghdt91/task#5979

task#5979
task#5980 fix help page
Merge pull request #183 from cuongnv540/task#5980

task#5980 fix help page
change time display in comment
Merge pull request #184 from cuongnv540/task#5987

change time display in comment
task__5991 fix active my poll when view others poll list
Merge pull request #186 from tunghdt91/task.5991

task__5991 fix active my poll when view others poll list
task#5961 set default min time for poll (at least 10 mins)