No Nether Portal Ambience

• Adds support for 26.1.x
• Raises the minimum version to 1.7.10 due to an oversight

Metadata:

• Made the flavor text for the supported version range more distinct

• The pack.mcmeta is up to date with the new format changes (pack_format is now 64 aka 1.21.8 and supported_formats minimum is now 15 aka 1.20, but it still retains all backwards-compatibility)

• Release for Modrinth