Base: Add more manpages

This commit adds manpages for About(1), AnalogClock(1), Assistant(1),
Browser(1), Calculator(1), and Calendar(1).

Base/usr/share/man/man1/About.md

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+## Name
+
+![Icon](/res/icons/16x16/ladyball.png) About - About SerenityOS
+
+[Open](file:///bin/About)
+
+## Synopsis
+
+```**sh
+$ About
+```
+
+## Description
+
+`About` is an application that displays information about Serenity.

Base/usr/share/man/man1/AnalogClock.md

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+## Name
+
+![Icon](/res/icons/16x16/app-analog-clock.png) Analog Clock - Serenity analog clock
+
+[Open](file:///bin/AnalogClock)
+
+## Synopsis
+
+```**sh
+$ AnalogClock
+```
+
+## Description
+
+`Analog Clock` provides an Analog Clock that can be moved around the desktop.

Base/usr/share/man/man1/Assistant.md

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+## Name
+
+Assistant - Serenity Assistant
+
+[Open](file:///bin/Assistant)
+
+## Synopsis
+
+```**sh
+$ Assistant
+```
+
+## Description
+
+`Assistant` is a helpful program that is used to search for and open applications, files, settings, and anything else a user may want to access. It can be opened by pressing `Super+Space` and closed by pressing `Esc`.

Base/usr/share/man/man1/Browser.md

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+## Name
+
+![Icon](/res/icons/16x16/app-browser.png) Browser - Serenity WWW Browser
+
+[Open](file:///bin/Browser)
+
+## Synopsis
+
+```**sh
+$ Browser
+$ Browser [options]
+$ Browser [url]
+```
+
+## Description
+
+`Browser` is an application used to view the World Wide Web. It is built on top of Serenity's own `LibWeb` and `LibJS` engines, allowing it to render HTML, CSS, and JavaScript.
+
+## Options
+
+* `--help`: Display help message and exit
+* `--version`: Display version number and exit
+
+## Arguments
+
+* `url`: URL to open
+
+## Examples
+
+```**sh
+$ Browser
+$ Browser --help
+$ Browser https://serenityos.org/
+```

Base/usr/share/man/man1/Calculator.md

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+## Name
+
+![Icon](/res/icons/16x16/app-calculator.png) Calculator - Serenity calculator
+
+[Open](file:///bin/Calculator)
+
+## Synopsis
+
+```**sh
+$ Calculator
+```
+
+## Description
+
+`Calculator` is a graphical calculator application. It supports basic arithmetic calculations in addition to special operations. It also has convenient shortcuts for mathmatical constants such as Pi.

Base/usr/share/man/man1/Calendar.md

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+## Name
+
+![Icon](/res/icons/16x16/app-calendar.png) Calendar - Serenity calendar
+
+[Open](file:///bin/Calendar)
+
+## Synopsis
+
+```**sh
+$ Calendar
+```
+
+## Description
+
+`Calendar` is a graphical calendar application for Serenity. It supports both Month View and Year View.