enable: markdown lint + check: links + spelling (#308)

#### What this PR does / why we need it:

This better public relation, when all links are working and there are no
typing errors.

#### Which issue(s) this PR fixes:

Some of the issues will be fixed as soon as
open-component-model/ocm#871 is merged.

---------

Co-authored-by: Gerald Morrison <67469729+morri-son@users.noreply.github.com>

.github/config/markdownignore

@@ -0,0 +1,2 @@
+/content/docs/cli-reference
+/content/docs/controller/controller-reference

.github/config/markdownlint.yml

@@ -0,0 +1,6 @@
+default: true
+
+MD013: false #Line length - https://github.com/DavidAnson/markdownlint/blob/HEAD/doc/Rules.md#md013
+MD033: false #Inline HTML - https://github.com/DavidAnson/markdownlint/blob/HEAD/doc/Rules.md#md033
+MD024:
+  siblings_only: true #Multiple headers with the same content

.github/config/spellcheck.yml

@@ -0,0 +1,22 @@
+matrix:
+  - name: Markdown
+    aspell:
+      lang: en
+      ignore-case: true
+      mode: markdown
+    dictionary:
+      wordlists:
+        - .github/config/wordlist.txt
+      encoding: utf-8
+    pipeline:
+      - pyspelling.filters.markdown:
+          markdown_extensions:
+            - pymdownx.superfences
+      - pyspelling.filters.html:
+          comments: false
+          ignores:
+            - code
+            - pre
+    sources:
+      - '**/*.md'
+    default_encoding: utf-8

.github/config/wordlist.txt

@@ -0,0 +1,290 @@
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+getresourcesbyname
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+updatevendorhash
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+valuemergehandlerdescriptor
+valueset
+versionedtypedobjects
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+wget
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+xml
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+yitsushi
+yml
+yyyy