Add hugo based docs

[withinboredom]

Description

Adds documentation for the docs with https://github.com/dapr/docs/pull/1209.

Goal:

1. To add PHP specific documentation for common use-cases
2. To share advanced scenarios for running in production

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #46

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• [x] Add actor documentation
• [x] Add state management docs
• [x] Add pubsub docs
• [x] Add serialization docs
• [x] Add unit testing docs

[codecov-io]

Codecov Report

Merging #49 (8992eca) into main (de740d8) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##               main      #49   +/-   ##
=========================================
  Coverage     72.80%   72.80%           
  Complexity      353      353           
=========================================
  Files            44       44           
  Lines          1331     1331           
=========================================
  Hits            969      969           
  Misses          362      362           

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update de740d8...8992eca. Read the comment docs.