Prepare release 3.0b

assigned to @nik

added 12 commits

• acec28a6...6191ad37 - 9 commits from branch master
• d8ba9be0 - Activate linting for frontend files
• 328443d8 - Reformat
• ef32b954 - Update changelog and bump version to 3.0b0

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added 2 commits

• b8307df1 - Reformat
• 22508e30 - Update changelog and bump version to 3.0b0

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added 1 commit

• 6cd28247 - Bump version to 3.0.1.dev0

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added 3 commits

• 0cbaa4aa - Add mdi prefix to icons in faq
• afa3fdd8 - Fix changelog
• 02494335 - Merge branch '50-icons-in-faq-won-t-load' into 'prepare-release-3.0b'

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added 2 commits

• 556ece4a - Revert "Bump version to 3.0.1.dev0"
• a96637d0 - Bump version to 3.0

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added 1 commit

• ee1ff7cf - Bump version to 3.0.1.dev0

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merged

mentioned in commit 88613b5c