Remove items deprecated <= v0.136.0 (note)

Remove items deprecated <= v0.136.0 (note)

Template functions:
- data.GetCSV / getCSV (use resources.GetRemote)
- data.GetJSON / getJSON (use resources.GetRemote)
- crypto.FNV32a (use hash.FNV32a)
- resources.Babel (use js.Babel)
- resources.PostCSS (use css.PostCSS)
- resources.ToCSS (use css.Sass)

Page methods:
- .Page.NextPage (use .Page.Next)
- .Page.PrevPage (use .Page.Prev)

Paginator:
- .Paginator.PageSize (use .Paginator.PagerSize)

Site methods:
- .Site.LastChange (use .Site.Lastmod)
- .Site.Author (use .Site.Params.Author)
- .Site.Authors (use .Site.Params.Authors)
- .Site.Social (use .Site.Params.Social)
- .Site.IsMultiLingual (use hugo.IsMultilingual)
- .Sites.First (use .Sites.Default)

Site config:
- paginate (use pagination.pagerSize)
- paginatePath (use pagination.path)

File caches:
- getjson cache
- getcsv cache