Should the free Islamic forum created using the "Ahla Montada" website be closed due to the website's copyright being preserved at the bottom of the forum, and the potential for seeing women's images or other forbidden content when entering the "Ahla Montada" website itself?

There is no harm in your forum containing a sub-forum whose name includes both truth and falsehood, or good and evil, since its mere existence does not necessitate anyone entering it. Nor does everyone who enters it necessarily intend to view any reprehensible content within it. The same applies to the presence of links to other social media sites.