update readme

[pawelru]

• remove r-universe from install instructions for simplicity
• remove link to the r-universe - this fixes url-checker
• add reference to the introduction article

[github-actions]

Unit Tests Summary

    1 files     70 suites   1h 7m 13s ⏱️
  724 tests   614 ✅ 110 💤 0 ❌
1 992 runs  1 767 ✅ 225 💤 0 ❌

Results for commit c1089a1.

♻️ This comment has been updated with latest results.

[github-actions]

Unit Test Performance Difference

Test Suite	$Status$	Time on main	$±Time$	$±Tests$	$±Skipped$	$±Failures$	$±Errors$
shinytest2-tm_a_gee	💔	$126.76$	$+12.94$	$0$	$0$	$0$	$0$
shinytest2-tm_a_mmrm	💔	$704.21$	$+20.14$	$0$	$0$	$0$	$0$
shinytest2-tm_g_barchart_simple	💔	$221.95$	$+3.73$	$0$	$0$	$0$	$0$
shinytest2-tm_g_ci	💔	$98.28$	$+5.44$	$0$	$0$	$0$	$0$
shinytest2-tm_g_forest_rsp	💔	$170.08$	$+5.22$	$0$	$0$	$0$	$0$
shinytest2-tm_g_forest_tte	💔	$63.84$	$+1.17$	$0$	$0$	$0$	$0$
shinytest2-tm_g_ipp	💚	$104.07$	$-2.38$	$0$	$0$	$0$	$0$
shinytest2-tm_g_lineplot	💔	$84.77$	$+1.38$	$0$	$0$	$0$	$0$
shinytest2-tm_g_pp_therapy	💚	$175.79$	$-3.01$	$0$	$0$	$0$	$0$
shinytest2-tm_g_pp_vitals	💚	$79.81$	$-1.86$	$0$	$0$	$0$	$0$
shinytest2-tm_t_abnormality	💚	$64.89$	$-1.17$	$0$	$0$	$0$	$0$
shinytest2-tm_t_abnormality_by_worst_grade	💚	$68.00$	$-2.51$	$0$	$0$	$0$	$0$
shinytest2-tm_t_ancova	💚	$92.76$	$-1.38$	$0$	$0$	$0$	$0$
shinytest2-tm_t_binary_outcome	💚	$73.91$	$-1.34$	$0$	$0$	$0$	$0$
shinytest2-tm_t_events_summary	💚	$61.84$	$-1.71$	$0$	$0$	$0$	$0$
shinytest2-tm_t_mult_events	💔	$53.54$	$+1.46$	$0$	$0$	$0$	$0$
shinytest2-tm_t_pp_laboratory	💚	$123.30$	$-1.88$	$0$	$0$	$0$	$0$
shinytest2-tm_t_shift_by_arm	💔	$55.48$	$+1.34$	$0$	$0$	$0$	$0$
shinytest2-tm_t_summary_by	💚	$76.66$	$-1.65$	$0$	$0$	$0$	$0$
shinytest2-tm_t_tte	💚	$62.36$	$-1.62$	$0$	$0$	$0$	$0$

Additional test case details

Test Suite	$Status$	Time on main	$±Time$	Test Case
shinytest2-tm_a_gee	💔	$6.99$	$+1.20$	e2e_tm_a_gee_Deselection_of_cor_struct_does_not_throw_validation_error.
shinytest2-tm_a_mmrm	💔	$17.43$	$+2.73$	e2e_tm_a_mmrm_Function_g_mmrm_lsmeans_selection_shows_output_settings_changing_settings_throws_no_validation_errors_and_verify_visibility_of_generated_plots.
shinytest2-tm_a_mmrm	💔	$13.50$	$+2.86$	e2e_tm_a_mmrm_Function_t_mmrm_lsmeans_selection_shows_output_settings_changing_settings_throws_no_validation_errors_and_verify_visibility_of_generated_tables.
shinytest2-tm_t_abnormality_by_worst_grade	💚	$11.72$	$-2.63$	e2e_tm_t_abnormality_by_worst_grade_Module_initializes_in_teal_without_errors_and_produces_table_output.

Results for commit eb73e07

♻️ This comment has been updated with latest results.

[Melkiades]

Lgtm! Thanks Pawel