Update README with African language cohorts

Add yoruba_nigeria (39 samples)

Add igbo_nigeria (36 samples)

Add hausa_nigeria (42 samples)

Add amharic_ethiopia (51 samples)

Remove metadata.csv.test artifact

Add conversational_english config to README

Add conversational_english cohort (4 meetings, 8 participants, 3 audio columns + transcripts)

Reorganize tables: accented english, other languages, medical domain

Update README: english_medical sample count 19 -> 8

Re-upload english_medical trimmed to 8 samples (224MB)

Delete english_medical for re-upload (trimmed to 250MB)

Update README: trimmed sample counts and multi-split tables

Add marathi_india (25 samples)

Add mandarin_chinese_china (25 samples)

Add malayalam_india (25 samples)

Update README with trimmed sample counts

Re-upload odia_india trimmed (21 samples)

Re-upload gujarati_india trimmed (18 samples)

Re-upload english_south_africa trimmed (17 samples)

Re-upload english_ireland trimmed (21 samples)

Re-upload english_haiti trimmed (21 samples)

Re-upload english_french_speaking trimmed (21 samples)

Re-upload english_belarus trimmed (21 samples)

Re-upload english_algeria trimmed (21 samples)

Delete odia_india for re-upload (trimmed)

Delete gujarati_india for re-upload (trimmed)

Delete english_south_africa for re-upload (trimmed)

Delete english_ireland for re-upload (trimmed)

Delete english_haiti for re-upload (trimmed)

Delete english_french_speaking for re-upload (trimmed)

Delete english_belarus for re-upload (trimmed)

Delete english_algeria for re-upload (trimmed)

Add vietnamese_vietnam

Add turkish_turkey

Add telugu_india

Add russian_russia

Add portuguese_brazil

Add odia_india

Add japanese_japan (25 samples)

Add italian_italy (25 samples)

Add gujarati_india (25 samples)

Add global_medical (25 samples)

Add french_global (25 samples)

Add french_canada (25 samples)

Add english_united_kingdom (25 samples)

Add english_ukraine (25 samples)

Add english_uganda (7 samples)

Add english_south_africa (25 samples)

Add english_russia (25 samples)