New Linux page (#491)

Co-Authored-By: Daniel Gray <dng@disroot.org>

_data/operating-systems/router/1_openwrt.yml

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+title: OpenWrt
+type: Recommendation
+logo: /assets/img/router/openwrt.svg
+logo_dark: /assets/img/router/openwrt-dark.svg
+description: |
+  **OpenWrt** is an operating system (in particular, an embedded operating system) based on the Linux kernel, primarily used on embedded devices to route network traffic. The main components are the Linux kernel, util-linux, uClibc, and BusyBox. All components have been optimized for size, to be small enough for fitting into the limited storage and memory available in home routers.
+
+  ## Notes
+  Consult the [Table of Hardware](https://openwrt.org/toh/start) to check if your device is supported.
+
+website: 'https://openwrt.org'
+downloads:
+  - icon: fab fa-git
+    url: 'https://git.openwrt.org/'

_data/operating-systems/router/2_pfsense.yml

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+title: pfSense
+type: Recommendation
+logo: /assets/img/router/pfsense.svg
+logo_dark: /assets/img/router/pfsense-dark.svg
+description: |
+  pfSense is an open source firewall/router computer software distribution based on FreeBSD. It is installed on a computer to make a dedicated firewall/router for a network and is noted for its reliability and offering features often only found in expensive commercial firewalls. pfSense is commonly deployed as a perimeter firewall, router, wireless access point, DHCP server, DNS server, and VPN endpoint.
+website: 'https://www.pfsense.org'
+privacy_policy: 'https://www.pfsense.org/privacy.html'
+downloads:
+  - icon: fab fa-github
+    url: 'https://github.com/pfsense'