Document new Trops subcommands: tldr, tablog, and view

[kojiwell]

Add explanations for the new subcommands, tldr, tablog, and view, recently added to Trops.

• trops tldr -- (TLDR = Table Log Direct and/or Too Long Don't Read)
  When you pipe the output of trops log into this command, it displays the logs in a table format.
  With the -s flag, it saves the table in Markdown format under $TROPS/tablog.
• trops tablog -- (“tablog” stands for Table + Log)
  This command is used to collect the files saved by trops tldr -s or to merge multiple tablog files into a single table.
• trops view -- When started with the --web flag and pointed to a folder containing tablog files, it opens a web interface that displays the logs as tables.
  You can click the <hex> part in trops show <hex>:<path> to see diffs, and click <path> to view the updated file.