fix: Shorten Codespaces welcome text #783

Job	Run time
run_ci (ubuntu-24.04, 3.11, discovery+lms+forum)	9m 33s
run_ci (ubuntu-24.04, 3.11, registrar+lms)	9m 51s
run_ci (ubuntu-24.04, 3.11, ecommerce+lms)	10m 18s
run_ci (ubuntu-24.04, 3.11, edx_notes_api+lms)	10m 47s
run_ci (ubuntu-24.04, 3.11, credentials+lms)	10m 36s
run_ci (ubuntu-24.04, 3.11, xqueue)	1m 46s
run_ci (ubuntu-24.04, 3.11, analyticsapi+insights+lms)	10m 34s
run_ci (ubuntu-24.04, 3.11, designer+lms)	10m 0s
run_ci (ubuntu-24.04, 3.11, enterprise-subsidy+enterprise-catalog+enterprise-access+lms)	11m 6s
run_ci (ubuntu-24.04, 3.11, license-manager+lms)	9m 59s
	1h 34m 30s

Provide feedback