fix: file preview for tsx, js, ts, html, lua

[Zeioth]

The fix is very simple: Instead of trusting the file mimetype, which file very often fail to determine accurately, we pygmentize the file based on its file extension.

From: https://www.reddit.com/r/ranger/comments/16s46s4 and many other similar threads trying to achieve this.

[Zeioth]

The reason for also adding lua, is file fails to determine its mimetype when mixed with vimscript variables, as in neovim .lua config files.

[Zeioth]

js and ts added to the fix. I've tested 22+ different programming languages and the preview seem to work fine on all of them now.

[klevvit]

I really like the idea of better rendering, but I consider we shouldn't remove or change significantly the options some users may actively use. Additional modifications, e.g. replacement of handle_fallback() with cat or switch to html as text not as page may be useful for some users, but it has huge influence on ranger functionality, so it's better to make it as an easy-to-switch option

[Zeioth]

I really like the idea of better rendering, but I consider we shouldn't remove or change significantly the options some users may actively use. Additional modifications, e.g. replacement of handle_fallback() with cat or switch to html as text not as page may be useful for some users, but it has huge influence on ranger functionality, so it's better to make it as an easy-to-switch option

The previous handle_fallback() provided error control, but it didn't provide sane defaults. There is no reason to ask the user to implement basic functionality when we can provide it (which this PR does).

If anything, I would add code comments to aid the users interested on re-implementing stuff.