Site (#1049)

by @akellbl4 

* create infrastructure for site

* wip

* fix docker build and add readme

* add docker-compose as a build and a run method

* rename compose file yaml -> yml

* add `src` as volume for watching changes

* update configs

* update README

* add padding at the end of the pages

* move demo settings in config

* fetch latest release from github

* update docs navigation

- add sections
- redirect from root of the section to first doc
- nice styles for navigation
- add brand colors

* cache github data from first load

* add redirects and fix link to docs

* fix docs nav styles

* add installation page placeholder

* fix demo

* add 404

* add dark theme, add theme switcher, remove unused files

* fix dark theme on main page

* fix dark theme background

* fix node version

* change installation docs

* add note block

* minor fixes

* add code highlighting styles

* fixes

* fixes

* mobile navigation, fix code highlighting colors

* fix dev server

* fix fetching error

* fix path to edit

Co-authored-by: Pavel Mineev <pavel@mineev.me>
Co-authored-by: Dmitry Verkhoturov <paskal.07@gmail.com>

docs/developers-guide/email-templates.md

@@ -0,0 +1,14 @@
+---
+title: Email templating
+---
+
+Remark42 uses golang templates for email templating. Templates are located in `backend/templates` and embedded into binary by statik
+
+For getting access to the files you can use package `templates` from `backend/app/templates`
+
+Now we have following templates:
+- `email_confirmation_login.html.tmpl` – used for confirmation of login
+- `email_confirmation_subscription.html.tmpl` – used for confirmation of subscription
+– `email_reply.html.tmpl` – used for sending replies to user comments (when user subscribed to it) and for noticing admins about new comments on a site
+– `email_unsubscribe.html.tmpl` – used for notification about successful unsubscribe from replies
+– `error_response.html.tmpl` – used for ...