Add Nubo Email to Email section

[koolninad]

Adds Nubo Email — privacy-first email platform available as Linux AppImage. Built on JMAP with calendar, drive, video meetings, and team chat.

Summary by Sourcery

Documentation:

• Document Nubo Email as a privacy-focused, nonfree email and collaboration platform available for Linux.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds Nubo Email as a non-free email and collaboration platform entry to the README’s Email section, including a brief feature description and Linux availability note.

File-Level Changes

Change	Details	Files
Add Nubo Email entry to the Email section of the README as a non-free client with a concise feature description.	Insert a new bullet in the Email section describing Nubo Email as a privacy-first email and collaboration platform Mark the entry with the non-free money icon indicator consistent with other non-open-source entries Mention key features (calendar, drive, video meetings, team chat), JMAP protocol basis, and Linux AppImage availability in the description	README.md

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[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="README.md" line_range="661" />
<code_context>
+- ![Nonfree][money icon] [Nubo Email](https://nubo.email/) - Privacy-first email and collaboration platform with calendar, drive, video meetings, and team chat. Built on JMAP protocol. Available as Linux AppImage.
</code_context>
<issue_to_address>
**nitpick (typo):** Consider adding "the" before "JMAP protocol" for smoother grammar.

This small change makes the sentence more natural to native speakers while keeping the meaning the same.

```suggestion
- ![Nonfree][money icon] [Nubo Email](https://nubo.email/) - Privacy-first email and collaboration platform with calendar, drive, video meetings, and team chat. Built on the JMAP protocol. Available as Linux AppImage.
```
</issue_to_address>

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[sourcery-ai]

nitpick (typo): Consider adding "the" before "JMAP protocol" for smoother grammar.

This small change makes the sentence more natural to native speakers while keeping the meaning the same.

Suggested change

	- ![Nonfree][money icon] [Nubo Email](https://nubo.email/) - Privacy-first email and collaboration platform with calendar, drive, video meetings, and team chat. Built on JMAP protocol. Available as Linux AppImage.
	- ![Nonfree][money icon] [Nubo Email](https://nubo.email/) - Privacy-first email and collaboration platform with calendar, drive, video meetings, and team chat. Built on the JMAP protocol. Available as Linux AppImage.