Remove 'On This Page' from a lot of pages

[seanbright]

Also removes a handful of weird things like lines that just contain percentages with no context (e.g. 40%)

[seanbright]

lines that just contain percentages with no context (e.g. 40%)

These come from the source material which contains this type of thing:

<ac:structured-macro ac:name="panel">
        <ac:parameter ac:name="bgColor">white</ac:parameter>
        <ac:parameter ac:name="title">Custom Device State Provider</ac:parameter>
        <ac:parameter ac:name="borderStyle">solid</ac:parameter>
        <ac:rich-text-body>
                <ac:structured-macro ac:name="section">
                        <ac:rich-text-body>
                                <ac:structured-macro ac:name="column">
                                        <ac:parameter ac:name="width">50%</ac:parameter>
                                        <ac:rich-text-body>
                                                <ac:macro ac:name="center">
                                                        <ac:rich-text-body><strong>Feature Description</strong></ac:rich-text-body>
                                                </ac:macro>
                                        </ac:rich-text-body>
                                </ac:structured-macro>
...

So any page that was in the wiki using this (I guess a "panel?") will not be rendering correctly in markdown.