Render html using render() rather than file_get_contents etc

[gopalsareen]

1. Render Html using render() rather than file_get_contents
2. Config Yaml name added for the purpose of After/Before priority.
3. Grid Field modified: field names added so that fields can be moved.

[codecov-io]

Codecov Report

Merging #35 into master will decrease coverage by 0.07%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##             master     #35      +/-   ##
===========================================
- Coverage     33.48%   33.4%   -0.08%     
  Complexity      176     176              
===========================================
  Files            16      16              
  Lines           451     452       +1     
===========================================
  Hits            151     151              
- Misses          300     301       +1

Impacted Files	Coverage Δ	Complexity Δ
src/Extensions/PageSeoExtension.php	50% <0%> (ø)	8 <0> (ø)	⬇️
src/Extensions/PageHealthExtension.php	0% <0%> (ø)	8 <0> (ø)	⬇️

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[wilr]

ping @zanderwar?

[zanderwar]

Thank you for this, apologies for the delay