feat: recover Search/Explore pages separation

[shuuji3]

This resolves #2063

Example screenshots

Before (previous /explore and new /explore/posts page)

After (new /explore page)

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[patak-dev]

I don't think we need a new option. We wanted to revert the change that merged explore and search but never got to it. See #1301 (comment). There is an open PR but I think it isn't working right #1704.

@shuuji3 could you remove the new option and directly revert what was done regarding the merge of explore/search in #1301 (there are other things too in that PR)? Or maybe yours already work if you remove the option.

[shuuji3]

Ah, thanks for pointing out. I missed that discussion. I'm going to remove the option and hide the trends post by default at first as it's easier to modify.

But it would be slightly different from the previous state so after that, I'll check #1704 and update the code to restore the previous behavior later.

[patak-dev]

Ok, no rush. Lets merge this one once the search route and explore route are completely separated to avoid glitches in https://main.elk.zone

[shuuji3]

44d1763 is an incomplete change so it's better to adopt #2075.