Replace akka-paradox plugin with paradox

[softinio]

As a quick way to remove the akka branding, lets replace akka-paradox plugin with paradox basic theme. We can make better with more Pekko branding later.

As discussed in #28 with @nvollmar

[softinio]

If no objection, I will start working on this tomorrow.

[mdedetrich]

@seglo @softinio @pjfanning So I tried to do just simply replace the akka paradox theme with the standard one and this made me fall down a rabbit hole. Here are the problems

• Due to the current Pekko sbt build only loading on an ancient JDK 1.8 version (it actually refuses to load otherwise) we are forced to downgrade to a version of parboiled that is bytecode compatible with JDK 1.8. I have managed to do this locally
• Although initially it might make sense to just replace addSbtPlugin("com.lightbend.akka" % "sbt-paradox-akka" % "0.44") with the various sbt paradox plugins initially, this will have to be repeated for every single pekko project. Furthermore at some point we would actually like to create a pekko theme, and in order to not repeat boilerplate in the 10+ repos we maintain it makes sense to create a sbt-paradox-pekko sbt plugin akin to sbt-paradox-akka. Initially it can be blank and essentially just contain the following dependencies

  addSbtPlugin("com.lightbend.paradox" % "sbt-paradox" % 0.10.3")
  addSbtPlugin("com.lightbend.paradox" % "sbt-paradox-apidoc" % "1.0.0")
  addSbtPlugin("com.lightbend.paradox" % "sbt-paradox-project-info" % "3.0.0")

  but later on an actual css/js theme can be added. I already have a sample sbt-paradox-pekko locally . The problem here
  is I haven't been able to figure out how to get override the parboiled version when using addSbtPlugin("org.apache.pekko" % "sbt-paradox-pekko" % "HEAD+20230107-1453")

[softinio]

@mdedetrich thanks for pushing this over the finish line. Last quarter I ended having unplanned bandwidth shortage. Happy New Year. Looking forward to contributing this quarter.