Cleanup: The readme is for people building/packaging OpenTTD. Player-focussed manuals are in the Wiki. (#10026)

README.md

@@ -116,35 +116,6 @@ Most types of add-on content can be downloaded within OpenTTD via the 'Check Onl
 
 Add-on content can also be installed manually, but that's more complicated; the [OpenTTD wiki](https://wiki.openttd.org/) may offer help with that, or the [OpenTTD directory structure guide](./docs/directory_structure.md).
 
-### 1.5.1) AI opponents
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-OpenTTD comes without AI opponents, so if you want to play with AIs you have to download them.
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-The easiest way is via the 'Check Online Content' button in the main menu.
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-You can select some AIs that you think are compatible with your playing style.
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-AI help and discussions may also be found in the [AI section of the forum](https://www.tt-forums.net/viewforum.php?f=65).
-
-### 1.5.2) Scenarios and height maps
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-Scenarios and heightmaps can be added via the 'Check Online Content' button in the main menu.
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-### 1.5.3) NewGRFs
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-A wide range of add-content is available as NewGRFs, including vehicles, industries, stations, landscape objects, town names and more.
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-NewGRFs can be added via the 'Check Online Content' button in the main menu.
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-See also the wiki [guide to NewGRFs](https://wiki.openttd.org/en/Manual/NewGRF) and [the forum graphics development section](https://www.tt-forums.net/viewforum.php?f=66).
-
-### 1.5.4) Game scripts
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-Game scripts can provide additional challenges or changes to the standard OpenTTD gameplay, for example setting transport goals, or changing town growth behaviour.
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-Game scripts can be added via the 'Check Online Content' button in the main menu.
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-See also the wiki [guide to game scripts](https://wiki.openttd.org/en/Manual/Game%20script) and [the forum graphics game script section](https://www.tt-forums.net/viewforum.php?f=65).
 
 ### 1.6) OpenTTD directories