* Addes some resources in sinhala language
* removed trailing slash on last edited sinhala resources file
* added some sinhala language resources
* updated
* added some sinhala language resources
* added some sinhala language resources
* Update courses/free-courses-si.md
* alphabetize, remove non-course
* Update courses/free-courses-si.md
* while I'm at it, remove (youtube)
* blanks
Co-authored-by: Eric Hellman <eric@hellman.net>