html dedent needed

[anatoly-scherbakov]

• Update spec
• HTTP loader & choose loader by scheme
• Parametrize load_html() by content type
• Tests should behave differently on YAML-LD only tests
• Remove misprint
• Enable the choice by protocol loader

[github-actions]

Test Diff Report

🎉 Newly passed!

• 🟢 tests.test_specification.test_expand[basic-manifest#html-dedent-not-needed]

• 🟢 tests.test_specification.test_expand[basic-manifest#html-and-yaml-streams]

• 🟢 tests.test_specification.test_expand[basic-manifest#html-dedent-needed]

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
yaml_ld
errors.py	43	1	98%	34
expand.py	45	4	91%	37, 59, 62, 65
flatten.py	14	1	93%	27
frame.py	30	1	97%	51
load_html.py	48	13	73%	61–65, 72, 83–85, 91–94
parse.py	63	26	59%	31–40, 49–70, 83, 113, 116, 119–120, 135
yaml_ld/document_loaders
base.py	8	1	88%	18
http.py	45	21	53%	18, 43–58, 61, 70–92
local_file.py	46	4	91%	47, 57–58, 82
TOTAL	510	72	86%

Tests	Skipped	Failures	Errors	Time
1317	846 💤	17 ❌	0 🔥	29.439s ⏱️