Theoretically speaking, you can use a Javascript crack via Greasemonkey or similar to make a person's computer do that. But as far as modifying the site itself to do this, you would have to hack their servers, which is very difficult, not to mention incredibly illegal.
a noun as in "a book" or "the book"
Yes, it is possible to modify the hardware in a Roku by upgrading it.
To modify the articles of confederation(see "Philadelphia Convention" Wikipedia) To modify the articles of confederation(see "Philadelphia Convention" Wikipedia)
No. That is not possible.
yes
Adverbs are used to modify verbs. Often, but not always, an adverb will end with -ly.
No. With is always a preposition. It cannot modify a noun or pronoun.
always sometimes never
Not possible. You can't modify software
No. An article is not technically an adjective, but its sole purpose (like adjectives) is to modify a noun. Articles can be called 'determiners' which are parts of speech considered separately from adjectives.
Having used the MediaWiki software, I can say that yes, this is in fact possible, though actually "deleting" something permanently is complicated and rather problematic. It would be more usual to modify the entry instead.
It is unlikely it will ever be possible to do so.