Add Glint / template import docs #532

Job	Run time
Lint	37s
Tests (ubuntu-latest, chrome)	52s
Floating Dependencies (ubuntu-latest, chrome)	2m 0s
Tests (ubuntu-latest, firefox)	1m 13s
Floating Dependencies (ubuntu-latest, firefox)	1m 8s
Tests - ember-lts-3.28	1m 27s
Tests - ember-lts-4.4	1m 49s
Tests - ember-lts-4.8	1m 24s
Tests - ember-lts-4.12	1m 18s
Tests - ember-5.0	1m 38s
Tests - ember-release	1m 33s
Tests - ember-default	1m 24s
Tests - tsc	26s
Tests - embroider-safe	1m 31s
Tests - embroider-optimized	1m 36s
Tests - ember-beta	1m 47s
Tests - ember-canary	1m 28s
	23m 11s

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