Document 1.1 preview features

[cinnamon-msft]

Add the following features to the docs site and tag them as Preview:

• Add title to command line arguments Add support for --title to the wt.exe commandline args microsoft/terminal#6296
• altGrAliasing profile setting Document "altGrAliasing" setting #50
• Add fullscreen and maximized to command line arguments Add support for --fullscreen, --maximized microsoft/terminal#6139
• Add support for fullscreen launchMode Add support for fullscreen launchMode microsoft/terminal#6060
• Add fontweight profile setting Document fontWeight setting #26
• Alt+Click to auto split pane Adds Alt+Click to auto split pane microsoft/terminal#5928
• Add compact tab sizing Add support for compact tab sizing microsoft/terminal#5787
• Right-click tab rename Enable tab renaming at runtime from the UI microsoft/terminal#5775
• Default profile accepts name of profile Allow the default profile to be specified by name microsoft/terminal#5706
• Tab color picker Add support for setting a tab's color at runtime w/ context menu microsoft/terminal#3789