Release v0.12.1

chore(release): phd-thesis 0.12.1

editing: Move methods to end of thesis
planning: Dynamic heterogeneities in dynamics chapter
editing: More descriptive titles
writing(sed): Starting on introduction
writing(sed): Start conclusion
editing(dynamics): Minor fixes to layout
editing(dynamics): Describe the decoupling figure
editing(dynamics): Fix SED relationships
fix: Use unicode symbols to build thesis
editing(sed): Updating text
editing(sed): Describe molecular relaxations
project(dynamics): Update figures to be nicer
figure: Graph visualisation of last passage time
chore(bib): Update bibliography
notes(dynamics): Additional descriptions of papers
editing(sed): First editing pass
project(dynamics): Include histogram for relaxation times
editing(sed): Update figures to remove placeholder
editing(sed): Describing jump dynamics
notes(dynamics): Assisting in the writeup