Update office.md outdated links to packages

[Leenuus]

Calibre and Foliate are no longer in community category but moved to extra. This PR updates their links.

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• Please assign task to ryosukeeeeee.

[Leenuus]

Hi, I am a new Arch user. Thank you all for this excellent guide on how to customize ArchLinux.

As you know I've made 2 PRs to update some old links. It seems a lot of them, apart from what I updated, are outdated now. According to ArchWiki's passage on official repository, these days ArchLinux Project's official repo is divided into core, extra, multilib. Thus no community category anymore(BTW, I know only little of Arch history).

After all, I think ArchLinuxTutorial should update to include some more information about ArchLinux Project itself(maybe history part, it is important to tell readers why we can trust Arch. Think about Ubuntu and Centos). And more information on how to make use of ArchWiki and AUR, I think it is really useful for the newcomers.

BTW, I am not sure what kind of readers this tutorial is for. I mean, for a normal user, install Arch from scratch is not easy. The builtin installation script provided since 2021 may be a better choice, also Manjaro. If it is for geeks or CS students, I think it is better to include some more upstream docs links and have a divided references section.

Thank you for your time. Feel free to tell me your idea. I am always here to help update this tutorial.

[ryosukeeeeee]

As you can see in the organization's homepage on github, our mission is to achieve freedom in four areas, and the mission of this project is to achieve device freedom in one of them. So far, the project has reached a high level of completion, and we can say that we have achieved our goal. As for comprehensive, timely, and detailed updates, we have no more energy to realize it at the moment. Now we are fully focused on the financial freedom aspect of one of the four freedoms we are talking about, and the corresponding project is the EtherRevelation(WIP). Any pull requests for ArchLinuxTutorial are welcome. Thank you for your contribution.

[Leenuus]

Get it, thank you for your response.