Update keywords

[jmooring]

Deletions from support.function.builtin.hugo:

• where (it already exists in keyword.control.hugo)
• eq (it already exists in support.function.builtin.gotemplate)
• printf (it already exists in support.function.builtin.gotemplate)

Additions to support.function.builtin.hugo:

• anchorize
• append
• complement
• cond
• div
• errorf
• fileExists
• float
• group
• hugo.BuildDate
• hugo.CommitHash
• hugo.Environment
• hugo.Generator
• hugo.IsProduction
• hugo.Version
• lang.Merge
• lang.NumFmt
• math.Ceil
• math.Floor
• math.Log
• math.Round
• math.Sqrt
• merge
• mod
• mul
• os.Stat
• path.Base
• path.Dir
• path.Ext
• path.Join
• path.Split
• reflect.IsMap
• reflect.IsSlice
• strings.HasSuffix
• strings.Repeat
• strings.RuneCount
• strings.TrimLeft
• strings.TrimPrefix
• strings.TrimRight
• strings.TrimSuffix
• sub
• symdiff
• templates.Exists
• transform.Unmarshal
• uniq
• urls.Parse
• warnf

Formatting:

• Alphabetized items in keyword.control.hugo to simplify list maintenance.
• Alphabetized items in support.function.builtin.gotemplate to simplify list maintenance.
• Alphabetized items in support.function.builtin.hugo to simplify list maintenance.

[budparr]

I think this looks good. @regisphilibert ?

[regisphilibert]

I'm really not familiar with the way those keywords are identified, but this looks good yes. I don't think the div keyword could overlap with the HTML tag.