create index of course iterations

index.md

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+# Introduction to bulk RNA-seq data analysis 
+
+This page provides an index for the iterations we ran for this course. 
+We recommend looking at the latest iteration, if you want the most up-to-date version of our content.
+
+- [June 2023](https://bioinformatics-core-shared-training.github.io/Bulk_RNAseq_Course_June23/)
+- [March 2023](https://bioinformatics-core-shared-training.github.io/Bulk_RNASeq_Course_March23/)
+- [November 2022](https://bioinformatics-core-shared-training.github.io/Bulk_RNAseq_Course_Nov22/)
+- [April 2022](https://bioinformatics-core-shared-training.github.io/Bulk_RNAseq_Course_Apr22/)
+- [February 2022](https://bioinformatics-core-shared-training.github.io/Bulk_RNASeq_Course_Feb22/)
+- [November 2021](https://bioinformatics-core-shared-training.github.io/Bulk_RNASeq_Course_Nov21/)
+- [June 2021](https://bioinformatics-core-shared-training.github.io/Bulk_RNAseq_Course_2021_June/)
+- [April 2021](https://bioinformatics-core-shared-training.github.io/Bulk_RNAseq_Course_2021_April/)
+- [March 2021](https://bioinformatics-core-shared-training.github.io/Bulk_RNAseq_Course_2021/)