[guides] Updating VisiData Documentation

[anjakefala]

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Guide to writing guides

• [ ] GuideIndex: A Guide to VisiData Guides (you are here)
• [ ] HelpGuide: Where to Start and How to Quit
• [x] MenuGuide: The VisiData Menu System (@anjakefala)
• [X] CommandsSheet: How to find the command you want to run (@thejud)

Barebones Basics

• [ ] MovementGuide: Movement and search
• [ ] InputGuide: Input keystrokes
• [ ] SortGuide: Sorting
• [x] ColumnsGuide: Rename, hide, and resize columns (@thejud)
• [x] TypesSheet: Column types (@reagle)

Let's Rev VisiData Up

• [X] SelectionGuide: Selecting and filtering (@anjakefala)
• [ ] ColumnsSheet: Columns: the only way to fly
• [ ] StatusesSheet: Revisit old status messages
• [ ] SidebarSheet: Dive into the sidebar
• [ ] SaversGuide: Saving Data
• [X] ErrrorsSheet: What was that error? (@anjakefala)
• [X] ModifyGuide: Adding, Editing, Deleting Rows (@thejud)

The Varieties of Data Experience

• [x] SlideGuide: Sliding rows and columns around (@thejud)
• [ ] ExprGuide: Compute Python over every row
• [ ] JoinGuide: Joining multiple sheets together
  • [ ] vd.help_join: Quick reference help sidebar available during Join command #1961
• [ ] DescribeSheet: Basic Statistics (min/max/mode/median/mean)
• [ ] AggregatorsSheet: Aggregations like sum, mean, and distinct
• [X] FrequencyTable: Frequency Tables are how you GROUP BY (@thejud)
• [X] PivotGuide: Pivot Tables are just Frequency Tables with more columns (@thejud)
• [x] MeltGuide: Melt is just Unpivot (@thejud)
• [X] JsonSheet: Some special features for JSON (@ajkerrigan)
• [ ] RegexGuide: Matching and Transforming Strings with Regex
• [ ] GraphSheet: Basic scatterplots and other graphs
• [ ] WindowFunctionGuide: Perform operations on groups of rows

For the Frequent User

• [ ] OptionsSheet: Options and Settings
• [x] ClipboardGuide: Copy and Paste Data via the Clipboard (@thejud)
• [x] DirSheet: Browsing the local filesystem (@anjakefala)
• [ ] FormatsSheet: What can you open with VisiData?
• [X] SplitpaneGuide: Split VisiData into two panes (@thejud)
• [ ] ThemesSheet: Change Interface Theme
• [ ] ColorSheet: See available colors
• [X] MacrosSheet: Recording macros (@anjakefala)
• [X] MemorySheet: Making note of certain values (@thejud)

Specific Use Cases

• [X] XsvGuide: CSV/TSV and other text-delimited formats (@saulpw)

Advanced Usage and Developers

• [ ] ThreadsSheet: Threads past and present
• [ ] DeveloperGuide: Inspecting internal Python objects

Appendices

• [ ] InputEditorGuide: Using the builtin line editor