Disable automatic hashtag links in knowls

[roed314]

If you try to add a cite command with a hashtag (which will be common for citations to mathlib), the knowl processing code currently raises an error. For example, try adding

\cite{mathlib:Algebra/Group/Defs.html#inv_mul_cancel_comm}

to the end of any knowl text while editing and look at the preview. After this PR, it works.

However, in order to fix it, we break the links created by using a hash keyword (like #Maass)

[edgarcosta]

I cannot look at this right now, but I faced this same issue before, and one needs to be quite carefull

[roed314]

Another option would be to turn off the hashtag pattern replacer, but I'm not sure how much that's used in our current knowls.

[roed314]

For the record, the places where the hashtag pattern replacer are intentionally used are:

• mf.maass.picard
• mf.maass.picard.eigenvalue
• mf.maass.picard.fourierexpansion
• mf.maass.picard.laplacian
• sage
• test.text

Except for the last test knowl, all end with Keywords: #Maass #Picard or Keywords: #Picard #Laplacian or Keywords: #Sage, which link to knowl search results.

There is also modcurve.cusp_widths.1711022896125866.comment where the replacement was unintentionally triggered.

I think it would be fine to drop this hashtag feature in order to not have to worry about changing the order as is currently done in this PR, but then I've never really been a hashtag fan.

[edgarcosta]

I agree that the we should get rid of the hashtag feature for keywords

[roed314]

Done. To review,

• make sure that you're happy with how the hashtags look in the knowls I mentioned above (e.g. mf.maass.picard)
• Check that you can add a mathlib link (e.g. edit any knowl, add \cite{mathlib:Algebra/Group/Defs.html#inv_mul_cancel_comm} to the end, make sure it previews correctly, then cancel your change).

[roed314]

I've removed all of the existing hashtag links (listed in this comment).