EPIC: Turn LMS install docs into KB articles

Links to LMS instances and install guides are here: https://docs.google.com/document/d/1p7XiZclKWDlkOxlcuHXdkrsGtemGeR5gQiJ4qUq7o00/edit#heading=h.3ky6j74kcjf5

# Canvas

Done - see #29

# Sakai

See install guide here: https://docs.google.com/document/d/1gzWctw0zbOoifIimye24PRZuUw5OO8wQj2wSZ17UsHQ/edit#heading=h.lnap379oxyys

- [x] [LMS Stub](https://web.hypothes.is/help/installing-the-hypothesis-lms-app-for-sakai/)
- [ ] [Installing the LMS app for Sakai at the Institutional Level](https://web.hypothes.is/help/installing-the-lms-app-for-sakai-at-the-institutional-level/) (just a stub; instructions coming soon)
- [x] [Installing the LMS app for Sakai at the Course Level](https://web.hypothes.is/help/installing-the-lms-app-for-sakai-at-the-course-level/)
- [x] [Using the Hypothesis LMS App with Lessons in Sakai](https://web.hypothes.is/help/using-the-hypothesis-lms-app-with-lessons-in-sakai/)

# Blackboard

See install guide here: https://docs.google.com/document/d/16lcLOUC8rH49qFLW78_FvAies2JaCLXpd27JMRzfcf4/edit

- [x] LMS Stub
- [x] Installing the LMS app for Blackboard: Administrator Guide
- [x] Using the Hypothesis LMS App in Blackboard (With Admin Install)
- [x] Using the Hypothesis LMS App in Blackboard (Without Admin Install)

# Moodle

See install guide: https://docs.google.com/document/d/17poBMaXGEp93MdL1MvAcS2uCYKbobh027kfQa_qVZ_s/edit#heading=h.h2chqxy5if8g

- [ ] LMS Stub
- [ ] Installing the LMS App for Moodle at the Institutional Level
- [ ] Installing the LMS App for Moodle at the Course Level
- [ ] Creating Hypothesis-enabled Activities in Moodle

# D2L

See install guide: https://docs.google.com/document/d/1cvgyrqiX1IQgs2vYx8rolj8J-l97eM2cJi3C9iP8v9Y/edit

- [x] LMS Stub
- [x] Installing the LMS App for D2L at the Institutional Level
- [x] Installing the LMS App for D2L at the Course Level
- [x] Using the Hypothesis LMS App in D2L

Review the linked Google Docs install guides and the existing KB articles listed in the issue, starting with the unchecked Sakai institutional and Moodle items. Track each checklist entry against its source guide; done means the remaining LMS installation and usage material is published as KB articles and the checklist is updated.

Written by the indexing model from the issue text.