Add julia engine highlights

Author: cwickham

docs/computations/julia.qmd

@@ -368,7 +368,7 @@ Ensure that `Revise` is installed in the project environment that the notebook
 is using, since the global environment is not included in the load path
 provided to Julia, unlike the behaviour of a Julia REPL session.
 
-### Caching
+### Caching {#caching-julia}
 
 The engine has built-in support for caching notebook results. This feature is disabled by
 default but can be enabled by setting `execute.cache` option to `true` in a notebook's

docs/prerelease/1.7/_highlights.qmd

@@ -1 +1,8 @@
-You can view (in-progress) documentation for the next version of Quarto, v1.7, on our pre-release documentation site, [prerelease.quarto.org](https://prerelease.quarto.org), including a list of [highlights](https://prerelease.quarto.org/docs/prerelease/1.7/).
+Quarto 1.7 includes the following new features:
+
+- Improvements to the `julia` engine: 
+  - [`juliaup` integration](/docs/computations/julia.qmd#juliaup-integration): Use specific versions of Julia in your notebooks.
+  - [R and Python support](/docs/computations/julia.qmd#r-and-python-support): Include `{r}` and `{python}` executable code cells via the RCall and PythonCall packages.
+  - [Caching](/docs/computations/julia.qmd#caching-julia): Save time rendering long-running notebooks by caching results.
+  - [Revise.jl integration](/docs/computations/julia.qmd#revise.jl-integration): Automatically update function definitions in Julia sessions.
+