Display SVG files as images instead of text (#14101)

* Change to display SVG files as images

* Remove unsafe styles from SVG CSP

* Add integration test to test SVG headers

* Add config setting to disable SVG rendering

* Add test for img tag when loading SVG image

* Remove the Raw view button for svg files since we don't fully support this

* Fix copyright year

* Rename and move config setting

* Add setting to cheat sheet in docs

* Fix so that comment matches cheat sheet

* Add allowing styles in CSP based on pull request feedback

* Re-enable raw button since we show SVG styles now

* Change so that SVG files are editable

* Add UI to toggle between source and rendered image for SVGs

* Change to show blame button for SVG images

* Fix to update ctx data

* Add test for DetectContentType when file is longer than sniffLen

Co-authored-by: Jonathan Tran <jon@allspice.io>
Co-authored-by: Kyle D <kdumontnu@gmail.com>

integrations/gitea-repositories-meta/user2/repo2.git/objects/0c/f15c3f66ec8384480ed9c3cf87c9e97fbb0ec3

@@ -0,0 +1,2 @@
+x
<01><><EFBFBD>m<EFBFBD> D<>M<15><>Y<EFBFBD><59><1A><>(<28>J
<01>`<60>5<EFBFBD>ɜ-<2D>K*Ki,Hi!?<3F><><<3C>i<EFBFBD>Vki0Z<30><5A>XH<58>D(Z6ĨG<C4A8>Sb<53><62>3<EFBFBD>JD<4A>h<EFBFBD><68>!<21>uB<1D><>DaJp<>	<09><><02><>F<EFBFBD>Lƹ4+~<7E><>v<EFBFBD>;<3B><><EFBFBD>
+e<><65><EFBFBD><EFBFBD><EFBFBD>[Nx>K<><4B><1C><><EFBFBD>_s<5F><73>q<>/<2F>]09MHpѤ<70><D1A4>k<EFBFBD><6B><EFBFBD>_d<5F>-%<25>풇۞<ED9287><DB9E>	v<>_<>]<5D><>^<5E>/<2F>I[t

integrations/gitea-repositories-meta/user2/repo2.git/objects/1c/887eaa8d81fa86da7695d8f635cf17813eb422

@@ -0,0 +1 @@
+x
+)JMU07b040031Q<31>*HM<48><4D>*Hg(<28>(<28><>=<3D><><EFBFBD><EFBFBD><EFBFBD>AvNA<4E><41><EFBFBD>6<><36><EFBFBD><EFBFBD><EFBFBD><EFBFBD>K<EFBFBD>+.KgH<67><48><EFBFBD>O<EFBFBD><4F>n9<6E><39>j<EFBFBD><6A>ًҳ4l<34>
<16><1B>

integrations/gitea-repositories-meta/user2/repo2.git/objects/71/911bf48766c7181518c1070911019fbb00b1fc

@@ -0,0 +1 @@
+x
<15>M<0E>@<0C><><EFBFBD>M<><19><17><08>r<EFBFBD>›<EFBFBD>6<EFBFBD><36>&&&<26><>9Le<4C>św<C59B><77><EFBFBD><EFBFBD>t<#<23><><EFBFBD>͡<>mv-<2D><>0w<30>b<EFBFBD><62>jy̖<79><CC96>ڗ~݋[<5B><><EFBFBD><EFBFBD><EFBFBD>=H<15><0C>.<2E>"<22><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǁ=

integrations/gitea-repositories-meta/user2/repo2.git/objects/c1/0d10b7e655b3dab1f53176db57c8219a5488d6

@@ -0,0 +1,2 @@
+x
<01><><EFBFBD>m<EFBFBD>0<10><><EFBFBD>)n<><06><>t2<14>S<07><04><><EFBFBD>`ņ<><C586><EFBFBD>e<EFBFBD>,VY<>/H<>#<23>[)<29><>E<EFBFBD><45>@N<>q<EFBFBD><71>툎<EFBFBD>r2<19>)D<><03>0<EFBFBD><30>j<EFBFBD>C<EFBFBD><1D><>L<07><>aC<61><43>&<26>4B<34>v]$E<><45><EFBFBD><1D>Iӑe<D391><65><EFBFBD><EFBFBD>P<EFBFBD>r<EFBFBD>I<EFBFBD>s<EFBFBD>e<EFBFBD>z<EFBFBD>˳~_
+<EFBFBD><EFBFBD><EFBFBD>[y<03><><EFBFBD><EFBFBD>v<EFBFBD><76>W<EFBFBD><57>V=헛<>˘<EFBFBD>H	vZ~s<>@݉%<25><><EFBFBD><EFBFBD>?T<>ZH

integrations/gitea-repositories-meta/user2/repo2.git/objects/info/packs

@@ -0,0 +1,2 @@
+P pack-a2f7ad943b3d857eb3ebdb4b35eeef38f63cf5d2.pack
+