Move media from layout to components

[MartijnCuppens]

As suggested by @ysds, move the media page from layout to components

• Moved page in menu structure
• Moved media-object.md file to components folder
• Also searched for occurrences of media-object page in links in the docs (but there is also a test for 404 links which covers this, I just realised this while I'm writing this 🙂)

Closes #27165

[XhmikosR]

Just a note, if we are going with this, we need to add a redirect too.

[MartijnCuppens]

@XhmikosR, I was also thinking about this, but if this is going to be changed in 4.2 and not in 4.1, it won't be necessary since we only add urls and not change them?

[XhmikosR]

True, but this is a fairly new scheme. And I'd rather err on the non-broken pages around the web :)

So, if this is going to be merged in a new minor version, I guess we don't need the redirect.

[XhmikosR]

@mdo: are you OK with this?

[mdo]

Eh, I'm not strongly attached to one direction over the other. For context, I don't see .media sticking around in v5 anyway, so it's dead to me either way lol. Y'all decide :).