I have Successfully changed the login page by changing the index file in webapps folder in dhis-web-login folder.
there we can can find folder for assets and can also change or alter the index.html file for the login page.
Yes that is also well and good practice but as I was exploring on the files and structure .. I was interested in changing it from the files directly and also wanted to know the mechanism on how can we achieve this..
I was check how the login page is linked to assets and maps icon and other files and by doing this I understood and gained knowledge about the links how the assets are loaded where are the stored. you know stuff like that.
well In short I was interested in it so that why i changed it directly from the files.