Update deploy.yml to remove problematic minifier step

[tlienart]

The minifier that Franklin leans on is buggy and, in any case, github pages optimises stuff for us so it's not needed.

In the context of #2006, it will help to disable it to see the generated HTML more clearly.

impact can be assessed here: https://github.com/JuliaLang/www.julialang.org/tree/gh-preview/previews/PR2013 where everything is generated properly and e.g. the index.html is not garbled anymore (and does actually have a closing html tag) https://github.com/JuliaLang/www.julialang.org/blob/gh-preview/previews/PR2013/index.html

[github-actions]

Once the build has completed, you can preview your PR at this URL: https://julialang.netlify.app/previews/PR2013/ in ~15 minutes

[LilithHafner]

Skipping minification does have a small performance impact, even with gzip. However, I find the justification here and in tlienart/Franklin.jl#836 and #2006 (comment) to be worth that performance cost.

curl https://julialang.org/ | wc -c
39252 characters
3083 bytes sent
47404 bytes received

curl https://julialang.netlify.app/previews/pr2013/ | wc -c
47558 characters (+21%)
3773 bytes sent (+22%)
56056 bytes received (+18%)

When using the --compressed flag,

curl --compressed https://julialang.org/ | wc -c
39252 characters
2238 bytes sent
16771 bytes received

curl --compressed https://julialang.netlify.app/previews/pr2013/ | wc -c
47558 characters (+21%)
2584 bytes sent (+15%)
16886 bytes received (+0.7%)