Remove MediaWiki pages

Remove pages specific to Mediawiki as we won't be using MediaWiki.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>

content/page/MediaWiki:Code_of_conduct.md

-Code of conduct
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content/page/MediaWiki:Code_of_conductpage.md

-Apertis:Code_of_conduct
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content/page/MediaWiki:Common.css.md

-/\* CSS placed here will be applied to all skins \*/
-body.page-Main_Page h1\#firstHeading {
-
-`   display: none;`
-
-}
-
-div.mw-geshi, div.mw-highlight {
-
-`   padding: 1em;`
-`   border: 1px dashed #2f6fab;`
-`   color: black;`
-`   background-color: #f9f9f9;`
-
-}
-
-div.mw-geshi, pre.source-css {
-
-`   font-size: 1.3em;`
-
-}
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content/page/MediaWiki:Ipbreason-dropdown.md

-  - Common block reasons
-      - Spammer
-      - Inserting false information
-      - Removing content from pages
-      - Spamming links to external sites
-      - Inserting nonsense/gibberish into pages
-      - Intimidating behavior/harassment
-      - Abusing multiple accounts
-      - Unacceptable username
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content/page/MediaWiki:Licenses.md

-  - Free licenses:
-      - CC BY-SA 4.0|Creative Commons Attribution-ShareAlike 4.0
-        International
-      - CC BY-NC-SA 4.0|Attribution-NonCommercial-ShareAlike 4.0
-        International
-      - CC0 1.0|CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
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content/page/MediaWiki:Recentchangeslogfilter-hidelogs.md

-$1 blocks, deletions and protections
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content/page/MediaWiki:Recentchangeslogfilter-pref.md

-Hide blocks, deletions and protections from the recent changes
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