"remove" syntax for string transform

[jake-figma]

A way to remove a substring from a string. Proposed approach would be a second pipe after the filter. This way, the template explicitly states how the input string should be filtered and transformed prior to searching for the substring. This gives template authors a reliable format to match against (they can always use raw filter if they want the original string):

• {{something|pascal|Something}} would remove "Something".
  • "SomethingGrand" becomes "Grand"
  • "something wonderful friend" becomes "WonderfulFriend"

Additionally, we could take the regex-y HTML attribute selector syntax from CSS (^ for "starts with" and $ for "ends with") and supplement with:

• {{something|pascal|^Something}} only a starting instance of "Something"
  • "SomethingGrand"
• {{something|pascal|$Something}} only an ending instance of "Something"
  • "GrandSomething"