Use hugo.toml instead of config.toml (#74)

* Use hugo.toml instead of config.toml

Use the file hugo.toml in both the README.md and the exampleSite, since
Hugo will look for this file first.

The current instructions (using config.toml) in a new Hugo site
(that has a hugo.toml-file) means that the site doesn't work, or the
theme is not activated.

Note that this is a breaking change for sites running on older versions.
(But v0.110.0 was released almost a year ago.)

Relevant Hugo commit:

f38a2fbd2e

* Require `hugo v0.110.0`

> Make hugo.toml the new config.toml

see https://github.com/gohugoio/hugo/releases/tag/v0.110.0

---------

Co-authored-by: Jan Raasch <425211+janraasch@users.noreply.github.com>

exampleSite/hugo.toml

@@ -0,0 +1,52 @@
+# Base URL used when generating links to your pages
+# Set to the URL for your site
+baseURL = "https://example.com"
+
+# The name of this wonderful theme ;-).
+theme = 'hugo-bearblog'
+
+# Basic metadata configuration for your blog.
+title = "Hugo ʕ•ᴥ•ʔ Bear Blog"
+author = "Jane Doe"
+copyright = "Copyright © 2020, Jane Doe."
+languageCode = "en-US"
+
+# Generate a nice robots.txt for SEO
+enableRobotsTXT = true
+
+# Generate "Bearblog"-like URLs !only!, see https://bearblog.dev/.
+disableKinds = ["taxonomy"]
+ignoreErrors = ["error-disable-taxonomy"]
+[permalinks]
+  blog = "/:slug/"
+  tags = "/blog/:slug"
+
+[params]
+  # The "description" of your website. This is used in the meta data of your generated html.
+  description = "Hugo + Bear = :heart:"
+
+  # The path to your "favicon". This should be a square (at least 32px x 32px) png-file.
+  # Hint: It's good practise to also put a "favicon.ico"-file into your "static"-folder.
+  favicon = "images/favicon.png"
+
+  # These "images" are used for the structured data templates. This will show up, when
+  # services like Twitter or Slack want to generate a preview of a link to your site.
+  # See https://gohugo.io/templates/internal#twitter-cards and
+  # https://gohugo.io/templates/internal#open-graph.
+  images = ["images/share.png"]
+
+  # Another "title" :-). This one is used as the site_name on the Hugo's internal
+  # opengraph structured data template.
+  # See https://ogp.me/ and https://gohugo.io/templates/internal#open-graph.
+  title = "Hugo ʕ•ᴥ•ʔ Bear"
+
+  # This theme will, by default, inject a made-with-line at the bottom of the page.
+  # You can turn it off, but we would really appreciate if you don’t :-).
+  # hideMadeWithLine = true
+
+  # By default, this theme displays dates with a format like "02 Jan, 2006", but
+  # you can customize it by setting the `dateFormat` param in your site's config
+  # file. See [Hugo's Format function docs](https://gohugo.io/functions/format/)
+  # for details. An example TOML config that uses [ISO
+  # 8601](https://en.wikipedia.org/wiki/ISO_8601) format:
+  # dateFormat = "2006-01-02"