Docs: revert README.md and update "documentation here" link on c.o extension listing
- The page at https://civicrm.org/extensions/line-item-editor says "please check the documentation here" and links to the github repo README.
- The github repo README says only that the repo has moved to l.c.o
- The l.c.o repo README is the same as the github repo README.
The original README (https://lab.civicrm.org/extensions/lineitemedit/-/blob/3312e43f09f0ca30216a2b3334b32e927da66c36/README.md) seems to have useful info. Seems like we could get that info back by:
- Reverting commit 6d971bfd in the l.c.o repo
- Editing https://civicrm.org/extensions/line-item-editor to point to the l.c.o. repo.