Pt 2091 doc migration render (#552)

PT-2091 Docs configuration for Render builds

* Added Sphinx-material theme and customizations
* Changed Makefile to use Material theme
* Customized the theme
* Added a separate config for render builds

config/sphinx-build/conf-material/conf.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+import sys
+import os
+sys.path.append(os.path.abspath("../"))
+from conf import *
+extensions.append('sphinx_gitstamp')
+extensions.append('sphinx_copybutton')
+html_sidebars['**']=['globaltoc.html', 'searchbox.html', 'localtoc.html', 'logo-text.html']
+html_theme = 'sphinx_material'
+html_theme_options = {
+    'base_url': 'http://bashtage.github.io/sphinx-material/',
+    'repo_url': 'https://github.com/percona/percona-server',
+    'repo_name': 'percona/percona-server',
+    'color_accent': 'grey',
+    'color_primary': 'orange',
+    'globaltoc_collapse': True,
+    'version_dropdown': True
+}
+html_logo = '../_static/percona-logo.svg'
+html_favicon = '../_static/percona_favicon.ico'
+pygments_style = 'emacs'
+gitstamp_fmt = "%b %d, %Y"
+# Specify the text pattern that won't be copied with the code block contents
+copybutton_prompt_text = '$'
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['../_static/_templates/theme']
+#html_last_updated_fmt = ''
+
+# Path to custom css files. These will override the default css attribute if they exist
+html_css_files = [
+    '../_static/css/material.css',
+]
+