Release updates

[tpike3]

Update init to 3.4.0.dev per release process

[github-actions]

Performance benchmarks:

Model	Size	Init time [95% CI]	Run time [95% CI]
BoltzmannWealth	small	🔵 +0.6% [+0.0%, +1.2%]	🔵 -0.5% [-0.6%, -0.3%]
BoltzmannWealth	large	🔵 -0.5% [-1.3%, +0.4%]	🔵 +0.4% [-0.8%, +1.7%]
Schelling	small	🔵 -0.1% [-0.3%, +0.3%]	🔵 -0.5% [-0.9%, -0.1%]
Schelling	large	🔵 -0.5% [-0.8%, -0.1%]	🔵 -1.2% [-2.6%, -0.1%]
WolfSheep	small	🔵 -0.9% [-1.1%, -0.6%]	🔵 +0.3% [+0.1%, +0.5%]
WolfSheep	large	🔵 -0.4% [-1.0%, +0.2%]	🔵 +1.4% [+0.8%, +2.3%]
BoidFlockers	small	🔵 -0.9% [-1.5%, -0.2%]	🔵 +0.4% [+0.2%, +0.6%]
BoidFlockers	large	🔵 -0.1% [-0.5%, +0.4%]	🔵 +0.7% [+0.4%, +1.0%]

[tpike3]

Apologies I didn't follow good dev practices with separate branches so I added the fix to #2836 (fix broken links in README) in this commit.