message: Update build_ngx_pagespeed_from_source.html
  Simplify a bit the manual compilation by avoiding temporary files and guessing some filenames.
  Note: Currently it still contains a lot of legacy code. I suggest to have the build instruction under source control. This would not only be expected, it'd also avoid having this script remain backward compatible.
diff: @@ -121,18 +121,16 @@ First download ngx_pagespeed:
  <pre>
  #[check the <a href="release_notes">release notes</a> for the latest version</a>]
  -NPS_VERSION=1.13.35.1-beta
  +NPS_VERSION=1.13.35.2-stable
  cd
  -wget https://github.com/apache/incubator-pagespeed-ngx/archive/v${NPS_VERSION}.zip
  -unzip v${NPS_VERSION}.zip
  +wget -O- https://github.com/apache/incubator-pagespeed-ngx/archive/v${NPS_VERSION}.tar.gz | tar -xz
  nps_dir=$(find . -name "*pagespeed-ngx-${NPS_VERSION}" -type d)
  cd "$nps_dir"
  NPS_RELEASE_NUMBER=${NPS_VERSION/beta/}
  NPS_RELEASE_NUMBER=${NPS_VERSION/stable/}
  psol_url=https://dl.google.com/dl/page-speed/psol/${NPS_RELEASE_NUMBER}.tar.gz
  [ -e scripts/format_binary_url.sh ] && psol_url=$(scripts/format_binary_url.sh PSOL_BINARY_URL)
  -wget ${psol_url}
  -tar -xzvf $(basename ${psol_url}) # extracts to psol/
  +wget -O- ${psol_url} | tar -xz # extracts to psol/
  </pre>
  <p>
  @@ -140,10 +138,10 @@ Download and build nginx with support for pagespeed:
  </p>
  <pre>
  -NGINX_VERSION=[check <a href="http://nginx.org/en/download.html">nginx's site</a> for the latest version]
  +#[check <a href="http://nginx.org/en/download.html">nginx's site</a> for the latest version]
  +NGINX_VERSION=1.18.0
  cd
  -wget http://nginx.org/download/nginx-${NGINX_VERSION}.tar.gz
  -tar -xvzf nginx-${NGINX_VERSION}.tar.gz
  +wget -O- http://nginx.org/download/nginx-${NGINX_VERSION}.tar.gz | tar -xz
  cd nginx-${NGINX_VERSION}/
  ./configure --add-module=$HOME/$nps_dir ${PS_NGX_EXTRA_FLAGS}
  make
  