feat: Add LocalSend

[Stensel8]

Summary

This PR adds a section about https://localsend.org/

Type of change

• feat — new page or feature

PR title and commit types must follow these standards — view the contributing guide

Checklist

• PR title follows the commit convention (e.g. fix: correct nmcli command in eduroam guide)
• Both EN and NL versions updated (if applicable)
• Media is in AVIF format (not PNG/JPG)
• No broken image references (/images/*.avif all exist in static/images/)
• Tested locally with hugo server

[Copilot]

Pull request overview

Adds LocalSend to the Applications docs as a recommended cross-platform local file transfer tool, including installation steps and firewall configuration guidance.

Changes:

• Add a new “LocalSend” section to both EN and NL Applications pages.
• Document CachyOS installation (pacman) and basic usage/discovery.
• Add AVIF screenshots for the LocalSend Android app and the CachyOS package page.

Reviewed changes

Copilot reviewed 2 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
content/docs/applications.md	Adds LocalSend documentation (overview, install, firewall rules, screenshots).
content/docs/applications.nl.md	Dutch translation of the LocalSend section (same structure/content).
static/images/localsend-cachyos-package.avif	Screenshot of LocalSend in the CachyOS package repository.
static/images/localsend-android-1.avif	Android screenshot (LocalSend app).
static/images/localsend-android-2.avif	Android screenshot (selecting files).
static/images/localsend-android-3.avif	Android screenshot (transfer in progress).

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