Merge pull request #499 from bourdillion/history-expiry

docs: add History Expiry wiki article

Author: taxmeifyoucan

docs/_sidebar.md

@@ -63,6 +63,7 @@
   - [eODS](/wiki/research/eODS.md)
   - [PeerDAS](/wiki/research/peerdas.md)
   - [FCR](/wiki/research/FCR/FCR.md)
+  - [History Expiry](/wiki/research/history-expiry/history-expiry.md)
   - Preconfirmations
     - [Preconfirmations](/wiki/research/Preconfirmations/Preconfirmations.md)
     - [Based Sequencing with Preconfs](/wiki/research/Preconfirmations/BasedSequencingPreconfs.md)