feat(blog): Register blog articles in hash-table

* adds a hash-table stored in a variable called `elblog-articles` that
  defines a map of article names (used as URI fragments) to file names
  of org-mode files
* adds a custom variable `elblog-article-directory` which must be set
  to the base path of the org-mode files representing elblog articles
* refactors the article-rendering functions to look up articles in the
  articles hash-table and renders them from there

After this change elblog is almost functional as a blog software, only
missing index generation.

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