prevent copy same book again
allow sync copied book

no test
add feature description for book introduction page

this page will be displayed on the first time user visit the book
finish copy book and sync book copy

manually tested
no intergration test pass
[f] sync book after copy
fix generate book prc script
Merge branch 'develop' into feature-book-introduction-page
fix test for screen with low height
[f] finish book introduction page
fix read book pagination drop line on mobile
allow user to config reading section in each browser
show the top banner at homepage ony

so that users will have more space
format the book filter by categories
remove book list help

as result of changing the book list template
remove dynamic locale middleware
notification allow login by tangthuvien account
notification login user has read log

next time user read the book
he/she will be redirect to the last read chapter
Merge branch 'develop' of github.com:squallcs12/tangthuvien into develop
Merge pull request #4 from squallcs12/feature-book-introduction-page

finish feature book introduction page
show onetime notification about user log in other places