Migrate to Bootstrap 5

[BernatBC]

Issue

Fixes #906

Description

Migrate Bootstrap 4 to 5.

I've done some testing, but there might be something odd (specially if the config is different than hugo-toha.github.io). If anyone finds some bugs, please tell me.

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[hossainemruz]

Thank you @BernatBC! I will take a look soon. From checking the deploy preview, look like the drop downs are not working.

[BernatBC]

Looks like I forgot to update Bootstrap to 5 in the example site. Now it should work.

[BernatBC]

For some reason it's not working in the preview, but it's fine locally.

[hossainemruz]

@BernatBC I have pushed few changes. They fixes the following issues:

1. Scroll spy was not working
2. Dropdown was not working
3. Card had accent color title instead of text color
4. Navbar brand title had text decoration
5. Sidebar and navbar switcher had border around them.
6. Scroll-to-top button had outline around it

I am pretty sure more issues will pop up. However, I think it is good enough for now. We will fix them when user reports them.

[hossainemruz]

For some reason it's not working in the preview, but it's fine locally.

Apparently, you forgot to update package.hugo.json which is used to generate package.json for the sites that uses this theme.